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प्रश्न
How does magnetic force depend on speed \[v\] when the other factors are fixed?
विकल्प
It is directly proportional to speed \[v\].
It is inversely proportional to speed \[v\].
It is independent of speed \[v\].
It is directly proportional to \[v^2\].
MCQ
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उत्तर
Experiments show that magnetic force is directly proportional to speed. A particle at rest has no magnetic force, consistent with this dependence.
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