A) In presence of electric field \[\overrightarrow{E}(r)\] and magnetic field \[\overrightarrow{B}(r)\] the force on a moving electric charge is \[\overrightarrow{F}=q[\overrightarrow{E}(r)+v\times \overrightarrow{B}(r)]\]
B) The force, due to magnetic field on a negative charge is opposite to that on a positive charge.
C) The force due to magnetic field are become zero if velocity and magnetic field are parallel or antiparallel.
D) For a static charge the magnetic force is maximum.
Correct Answer: D
Solution :
[d] If charge is not moving then the magnetic force is zero. Since \[\overrightarrow{F}\,\,m=q(\overrightarrow{v}\times \overrightarrow{B})\] As \[\overrightarrow{v}\,=0,\] for stationary charge \[\therefore \] \[\overrightarrow{F}\,\,m=0\]
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