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JEE Advanced2015PhysicsMagnetic Effects of CurrentActual

A Conductor (shown in the figure) carrying constant current I is kept in the x - y plane in a uniform magnetic field B → . If F is the magnitude of the total magnetic force acting on the conductor, then the correct statement(s) is (are)

Options

  1. AIf B → is along z ^ , F ∝ ( L + R )
  2. BIf B → is along x ^ , F = 0
  3. CIf B → is along y ^ , F ∝ ( L + R )
  4. DIf B → is along z ^ , F = 0

Correct answer

A. If B → is along z ^ , F ∝ ( L + R )

Step-by-step solution

F → = I D i s p l a c e m e n t → × B → As magnetic field is uniform F → = I 2 L + 2 R i ^ × B → When B → is along y or z axis F ∝ L + R When B → is along x -axis F = 0

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