Q.

An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true ?

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a

The electron path will be circular about the axis.

b

The electron will be accelerated along the axis.

c

The electron will continue to move with uniform velocity along the axis of the solenoid.

d

The electron will experience a force at 45° to the axis and hence execute a helical path.

answer is D.

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Detailed Solution

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As the magnetic field of a solenoid is along its axis, the magnetic force on the electron will be zero. So, the electron will be unaffected by the magnetic field, and it will move without any deviation along the axis of the solenoid.

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