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Question
A magnetic field exerts no force on:
an electrical charge moving perpendicular to its direction
an unmagnetised iron bar
a stationary electric charge
a magnet
Solution
a stationary electric charge
Magnetic force is given by Lorentz equation as:
`F=q(VxxB)`
Here, q = amount of electric charge, V = velocity of charge and B= magnetic flux
Thus, when velocity of charge (V)=0 magnetic force (F) = 0
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