Doubts
Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents
Sign in to save progress →
Doubts
Sign in

Magnetics question

2020 · 9 Jan · Shift 1 · Q63
Guest · try one question or challengeGuest · try one question or challenge
  1. PYQ Library
  2. /JEE Main
  3. /Physics
  4. /Magnetics
  5. /2020 · 9 Jan · Shift 1 · Q63

Magnetics question

2020 · 9 Jan · Shift 1 · Q63

JEE MainPhysicsMagneticsMCQ+4 / −1
A long, straight wire of radius a carries a current distributed uniformly over its cross-section. The ratio of the magnetic fields due to the wire at distance a3{a \over 3}3a​ and 2 aaa, respectively from the axis of the wire is :
  1. A
    2
  2. B
    12{1 \over 2}21​
  3. C
    32{3 \over 2}23​
  4. D
    23{2 \over 3}32​
PreviousNext

More from Magnetics

  • An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/length and carries a current I. The electron gun shoots an electron along the radius of the solenoid with speed v. If the electron does not… Includes diagram2020 · MCQ
  • A small circular loop of conducting wire has radius a and carries current I. It is placed in a uniform magnetic field B perpendicular to its plane such that when rotated slightly about its diameter and released, it starts performing simple…2020 · MCQ
  • A thin strip 10 cm long is on a U shaped wire of negligible resistance and it is connected to a spring of spring constant 0.5 Nm–1 (see figure). The assembly is kept in a uniform magnetic field of 0.1 T. If the strip is pulled from its… Includes diagram2019 · MCQ
  • A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field B i∧​ . The torque on the coil due to the magnetic field is :2019 · MCQ
  • Two very long, straight, and insulated wires are kept at 90° angle from each other in xy-plane as shown in the figure. These wires carry currents of equal magnitude I, whose directions are shown in the figure. The net magnetic field at… Includes diagram2019 · MCQ
  • A rectangular coil (Dimension 5 cm × 2.5 cm) with 100 turns, carrying a current of 3 A in the clock-wise direction is kept centered at the origin and in the X-Z plane. A magnetic field of 1 T is applied along X-axis. If the coil is tilted…2019 · MCQ
  • A rigid square loop of side 'a' and carrying current I2 is lying on a horizontal surface near a long current I1 carrying wire in the same plane as shown in figure. The net force on the loop due to wire will be : Includes diagram2019 · MCQ
  • A moving coil galvanometer has a coil with 175 turns and area 1 cm2. It uses a torsion band of torsion constant 10–6 N-m/rad. The coil is placed in a maganetic field B parallel to its plane. The coil deflects by 1° for a current of 1 mA.…2019 · MCQ