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Moving Charges and Magnetism question

2023 · Q144
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Moving Charges and Magnetism question

2023 · Q144

NEETPhysicsMoving Charges and MagnetismMCQ+4 / −1

A long straight wire of length 2 m2 \mathrm{~m}2 m and mass 250 g250 \mathrm{~g}250 g is suspended horizontally in a uniform horizontal magnetic field of 0.7 T0.7 \mathrm{~T}0.7 T. The amount of current flowing through the wire will be (g=9.8 ms−2)\left(\mathrm{g}=9.8 \mathrm{~ms}^{-2}\right)(g=9.8 ms−2) :

  1. A
    2.45 A
  2. B
    2.25 A
  3. C
    2.75 A
  4. D
    1.75 A
View written solutionFree

Correct answer: D

NEET 2023 Manipur Physics - Moving Charges and Magnetism Question 7 English Explanation

$$\begin{aligned} \& \mathrm{m g=i \ell B} \\\\ \& 250 \times 10^{-3} \times 9.8=\mathrm{i} \times 2 \times 0.7 \\\\ \& \mathrm{i}=\frac{0.250 \times 9.8}{2 \times 0.7}=0.250 \times 7 \\\\ \& \mathrm{i}=1.75 \mathrm{~A} \end{aligned} $$

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