JEE Main · 2024 · 04 Apr 2024 · Shift 1 · Magnetic Effects of Current

An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then :

(A)the electron will be accelerated along the axis.
(B)the electron will continue to move with uniform velocity along the axis of the solenoid.✓ Correct
(C)the electron path will be circular about the axis.
(D)the electron will experience a force at $4 5^{\circ}$ to the axis and execute a helical path.

Answer: (B)

Solution

Inside a long solenoid the magnetic field

B

is along the axis. The electron is projected along the axis, so

v ∥ B

.

The magnetic force is

F = - e v \times B = 0

when

v ∥ B

. With no force, the electron continues with uniform velocity along the axis. Option B.

JEE Main · 2024 · 04 Apr 2024 · Shift 1 · Single correct option

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