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AIIMS2008PhysicsMagnetic Effects of Current

Two changes (+q ) and (-q ) are attached to the two ends of a light rod of length (L ), as shown in figure. The system is given a velocity (v ) perpendicular to magnetic field ( B ). The magnetic force on the system of charges and magnitude of force on one charge by the rod, are respectively

Options

  1. Azero, zero
  2. Bzero, (q v B )
  3. C(2 q v B, 0 )
  4. D(2 q v B, q v B )

Correct answer

B. zero, (q v B )

Step-by-step solution

Net charge on system =0 Net force on system =0 . Now consider one charge : F=q v B .

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