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Electrostatics

71 questions · Physics · NEET
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Electrostatics

71 questions · Physics · NEET

  1. An electric dipole with dipole moment 5×10−6Cm is aligned with the direction of a uniform electric field of magnitude 4×105 N/C. The dipole is then rotated through an angle of 60∘…2025 · Q137 · MCQ
  2. Two identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is q and the force of repulsion between them is F. A third identical uncharged conducting sphere is brought…2025 · Q152 · MCQ
  3. A thin spherical shell is charged by some source. The potential difference between the two points C and P (in V) shown in the figure is: (Take 4πε0​1​=9×109 SI units) Includes diagram2024 · Q165 · MCQ
  4. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The potential (V) at any axial point, at 2 m distance (r) from the centre of the dipole of dipole moment…2024 · Q184 · MCQ
  5. A metal cube of side 5 cm is charged with 6μC. The surface charge density on the cube is2024 · Q153 · MCQ
  6. The value of electric potential at a distance of 9 cm from the point charge 4×10−7C is [Given 4πε0​1​=9×109 N m2C−2] :2024 · Q187 · MCQ
  7. According to Gauss law of electrostatics, electric flux through a closed surface depends on :2023 · Q145 · MCQ
  8. A charge Q μC is placed at the centre of a cube. The flux coming out from any one of its faces will be (in SI unit) :2023 · Q158 · MCQ
  9. If a conducting sphere of radius R is charged. Then the electric field at a distance r(r>R) from the centre of the sphere would be, (V= potential on the surface of the sphere)2023 · Q163 · MCQ
  10. An electric dipole is placed at an angle of 30∘ with an electric field of intensity 2×105NC−1. It experiences a torque equal to 4 N m. Calculate the magnitude of charge on the dipole, if the…2023 · Q131 · MCQ
  11. If s∮​E⋅dS=0 over a surface, then:2023 · Q152 · MCQ
  12. An electric dipole is placed as shown in the figure. The electric potential (in 102 V) at point P due to the dipole is (∈0​ = permittivity of free space and 4πϵ0​1​ = K) : Includes diagram2023 · Q168 · MCQ
  13. Six charges +q, −q, +q, −q, +q, and −q are fixed at the corners of a hexagon of side d as shown in the figure. The work done in bringing a charge q0 to the centre of the hexagon from infinity is (ε0​ - permittivity of… Includes diagram2022 · Q178 · MCQ
  14. The angle between the electric lines of force and the equipotential surface is2022 · Q140 · MCQ
  15. Two hollow conducting spheres of radii R1 and R2 (R1 >> R2) have equal charges. The potential would be2022 · Q154 · MCQ
  16. Two point charges −q and +q are placed at a distance of L, as shown in the figure. The magnitude of electric field intensity at a distance R(R >> L) varies as: Includes diagram2022 · Q166 · MCQ
  17. Polar molecules are the molecules :2021 · Q134 · MCQ
  18. A dipole is placed in an electric field as shown. In which direction will it move? Includes diagram2021 · Q146 · MCQ
  19. Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres (σ1 / σ2) is :2021 · Q151 · MCQ
  20. Twenty seven drops of same size are charged at 220V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.2021 · Q170 · MCQ
  21. A short electric dipole has a dipole moment of 16 × 10-9 Cm. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60∘ with the…2020 · Q119 · MCQ
  22. In a certain region of space with volume 0.2 m3, the electric potential is found to be 5 V throughout. The magnitude of electric field in this region is :2020 · Q150 · MCQ
  23. A spherical conductor of radius 10 cm has a charge of 3.2 × 10-7 C distributed uniformly. That is the magnetude of electric field at a point 15 cm from the centre of the sphere? (4πε0​1​=9×109Nm2/c2)…2020 · Q153 · MCQ
  24. Two point charges A and B, having charges +Q and – Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes :2019 · Q120 · MCQ
  25. Two parallel infinite line charges with linear charge densities +λ C/m and -λ C/m are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges?2019 · Q134 · MCQ
  26. A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre :2019 · Q139 · MCQ
  27. A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field E . Due to the force qE , its velocity increases from 0 to 6 m s–1 in one second…2018 · Q121 · MCQ
  28. An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest…2018 · Q158 · MCQ
  29. Suppose the charge of a proton and an electron differ slightly. One of them is −e, the other is (e + Δe). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (musch greater…2017 · Q124 · MCQ
  30. The diagrams below show regions of equipotentials. A positive charge is moved from A to B in each diagram. Includes diagram2017 · Q125 · MCQ
  31. Two identical charged spheres suspended from a common point by two massless strings of lengths l, are initially at a distance d(d < < l) apart because of their mutual repulsion. The charges begin to leak from both the spheres at…2016 · Q119 · MCQ
  32. An electric dipole is placed at an angle of 30o with an electric field intensity 2 × 105 N C−1. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is2016 · Q131 · MCQ
  33. If potential (in volts) in a region is expressed as V(x, y, z) = 6xy − y + 2yz, the electric field (in N/C) at point (1, 1, 0) is2015 · Q112 · MCQ
  34. The electric field in a certain region is acting radially outward and is given by E = Ar. A charge contained in a sphere of radius 'a' centred at the origin of the field, will be given by2015 · Q116 · MCQ
  35. A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the centre of the sphere rrespectively are2014 · Q119 · MCQ
  36. In a region, the potential is represented by V(x, y, z) = 6x − 8xy − 8y + 6yz, where V is in volts and x, y, z are in metres. The electric force experienced by a charge of 2 coulomb situated at point (1, 1, 1) is2014 · Q129 · MCQ
  37. An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90o is2013 · Q123 · MCQ
  38. A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to2013 · Q134 · MCQ
  39. A, B and C are three points in a uniform electric field. The electric potential is Includes diagram2013 · Q122 · MCQ
  40. Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between… Includes diagram2013 · Q133 · MCQ
  41. Two metallic spheres of radii 1 cm and 3 cm are given charges of −1 × 10−2 C and 5 × 10−2 C, respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is2012 · Q94 · MCQ
  42. An electric dipole of moment p is placed in an electric field of intensity E. The dipole acquires a position such that the axis of the dipole makes an angle θ with the direction of the field. Assuming that the potential energy of…2012 · Q171 · MCQ
  43. What is the flux through a cube of side a if a point charge of q is at one of its corner?2012 · Q172 · MCQ
  44. Four point charges −Q, −q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is2012 · Q173 · MCQ
  45. Three charges, each +q, are placed at the corners of an isosceles triangle ABC of sides BC and AC, 2a. D and E are the mid points of BC and CA. The work done in taking a charge Q from D to E is Includes diagram2011 · Q96 · MCQ
  46. The electric potential V at any point (x, y, z), all in metres in space is given by V = 4x2 volt. The electric field at the point (1, 0, 2) in volt/meter, is2011 · Q97 · MCQ
  47. Four electric charges +q, +q, − q and − q are placed at the corners of a square of side 2L (see figure). The electric potential at point A, midway between the two charges + q and +q, is Includes diagram2011 · Q163 · MCQ
  48. A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will2011 · Q164 · MCQ
  49. The electric field at a distance 23R​ from the centre of a charged conducting spherical shell of radius R is E. The electric field at a distance 2R​ from the centre of the sphere is2010 · Q88 · MCQ
  50. A square surface of side L meter in the plane of the paper is placed in a uniform electric field E(volt/m) acting along the same plane at an angle θ with the horizontal side of the square as shown in figurre. The electric flux… Includes diagram2010 · Q185 · MCQ
  51. Two positives ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron)2010 · Q186 · MCQ
  52. The electric potential at a point (x, y, z) is given by V = −x2y − xz3 + 4 The electric field at that point is2009 · Q143 · MCQ
  53. Three concentric spherical shells have radii a, b and c (a < b < c) anf have surface charge densities σ, −σ and σ respectively. If VA, VB and VC denote the potentials of the three shells, then, for c = a +…2009 · Q173 · MCQ
  54. A thin conducting ring of radius R is given a charge +Q. The electric field at the centre O of the ring due to the charge on the part AKB of the ring is E. The electric field at the centre due to the charge on the part ACDB of the ring is Includes diagram2008 · Q165 · MCQ
  55. The electric potential at a point in free space due to charge Q coulomb is Q × 1011 volts. The electric field at that point is2008 · Q166 · MCQ
  56. Charges +q and −q are placed at points A and B respectively which are a distance 2L apart, C is the midnight between A and B. The work done in moving a charge + Q along the semicircle CRD is Includes diagram2007 · Q147 · MCQ
  57. A hollow cylinder has a charge q coulomb within it. If f is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of V-m will be Includes diagram2007 · Q148 · MCQ
  58. Three point charges +q, − 2q and + q are placed at points (x = 0, y = a, z = 0), (x = 0, y = 0, z = 0) and (x = a, y = 0, z = 0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are2007 · Q149 · MCQ
  59. A square surface of side L metres is in the plane of the paper. A uniform electric field E (volt/m), also in the plane of the paper is limited only to the lower half of the square surface (see figure). The electric flux… Includes diagram2006 · Q130 · MCQ
  60. An electric dipole of moment p​ is lying along a uniform electric field E. The work done in rotating the dipole by 90o is2006 · Q141 · MCQ
  61. As per the diagram a point charge +q is placed at the origin O. Work done in taking another point charge −Q from the point A [coordinates (0, a)] to another point B Includes diagram2005 · Q171 · MCQ
  62. Two charges q1 and q2 are placed 30 cm apart, as shown in the figure. A third charge q3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is 4πε0​q3​​… Includes diagram2005 · Q172 · MCQ
  63. An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are…2004 · Q130 · MCQ
  64. A bullet of mass 2 g is having a charge of 2 μC. Through what potential difference must it be accelerated, starting from rst, to acquire a speed of 10 m/s ?2004 · Q159 · MCQ
  65. A charge q is located at the centre of a cube. The electric flux through any face is2003 · Q142 · MCQ
  66. Identical charges (−q) are placed at each corners of cube of side b then electrostatic potential energy of charge (+q) which is placed at centre of cube will be2002 · Q171 · MCQ
  67. Some charge is being given to a conductor. Then its potential is2002 · Q172 · MCQ
  68. A dipole of dipole moment p​ is placed in uniform electric field E then torque acting on it is given by2001 · Q167 · MCQ
  69. A charge QμC is placed at the centre of a cube, the flux coming out from each face will be2001 · Q168 · MCQ
  70. A charge Q is situated at the corner of a cube, the electric flux passed through all the six faces of the cube is2000 · Q125 · MCQ
  71. Electric field at centre O of semicircle of radius a having linear charge density λ given as Includes diagram2000 · Q136 · MCQ