alleryThe direction of a magnetic field at a point is shown by what?
AA thermometer
BA compass needle
CA spring balance
DA stopwatch
Answer & Solution
Correct answer: B. A compass needle
1. The field direction is a defined property of the B field.
2. It lies along the orientation of a compass needle.
3. Other instruments do not respond to field direction.
_Source: Wikipedia, Magnet, Magnetic field_
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