Question

How does magnetic force depend on speed \[v\] when the other factors are fixed?

Options

• 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 \[v^2\].

Answer 1

Experiments show that magnetic force is directly proportional to speed. A particle at rest has no magnetic force, consistent with this dependence.