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JEE Main202524 Jan 2025Evening ShiftPhysicsMagnetic Effects of CurrentActual

N equally spaced charges each of value q , are placed on a circle of radius R . The circle rotates about its axis with an angular velocity as shown in the figure. A bigger Amperian loop B encloses the whole circle where as a smaller Amperian loop A encloses a small segment. The difference between enclosed currents, I_A-I_B , for the given Amperian loops is

Options

  1. A2 N q
  2. BN ^2 2 q
  3. CN q
  4. DN 2 q

Correct answer

D. N 2 q

Step-by-step solution

aligned & I_A= N q 2 & I_A= N q 2 , I_B=0 & I_A=I_B= N q 2 aligned

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