A) an accelerating force
B) a retarding force
C) a radial force
D) no force
Correct Answer: D
Solution :
Inside a solenoid, magnetic field is along axis. The force on moving charged particle in magnetic field, F = qvB sin\[\theta \] Particle is moving in direction of magnetic field. \[\therefore \] \[\theta =0{}^\circ \] \[\therefore \] \[F=0\] \[\{\because \,sin0{}^\circ =0\}\]
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