Physics
Grade-10
Easy

Question

A uniform magnetic field B is directed along the positive z-axis along which an infinitely long cylinder is kept parallel. As seen from the z-axis, the direction of the induced current is:

  1. Anticlockwise of the +ve z axis
  2. Along the magnetic field
  3. Zero
  4. Clockwise of the +ve z axis

hintHint:

When the cylinder is parallel to the z-axis of magnetic field B, the induced current will be zero.

The correct answer is: Zero


    When the cylinder is parallel to the z-axis of magnetic field B, the induced current will be zero.
    • The induced current would be maximum if the cylinder is in perpendicular to the z-axis.
    • Here, the cylinder is kept parallel to the z-axis.
    • The induced current and its direction will be zero as it is in 180 degrees from the axis.
    • Since the magnetic field B is uniform, there is no change in the magnetic flux linked with the cylindrical wire.

    • Hence no current will be induced on the surface of the cylindrical wire.

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