A magnetic compass will be deflected if it is kept near a____________________?
Correct answer: A. charge in motion
- A. charge in motion
- B. charge at rest
- C. both
- D. none
Explanation
A moving charge produces a magnetic field, and that field can exert torque on the magnetic needle of a compass. A stationary charge produces only an electric field, so it does not normally deflect the compass. The likely wrong choice is c, which incorrectly treats stationary and moving charges as magnetically equivalent.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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