MCQ
A magnetic field exerts no force on:
- AAn electrical charge moving perpendicular to its direction...
- BAn unmagnetised iron bar.
- CA stationary electric charge.
- DA magnet.
✓
Answer
- A stationary electric charge.
Explanation:
Magnetic force is given by Lorentz equation as:
F = q(v × B)
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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