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4.Moving Charges and Magnetism
hard
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.
C
the electron path will be circular about the axis.
D
the electron will experience a force at $45^{\circ}$ to the axis and execute a helical path.
(JEE MAIN-2024)
Solution

Since $\vec{v} \| \vec{B}$ so force on electron due to magnetic field is zero. So it will move along axis with uniform velocity.
Standard 12
Physics
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