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प्रश्न
The present of magnetic field at a point can be detected by ______.
विकल्प
a strong magnet
a solenoid
a compass needle
a current carrying wire
उत्तर
The presence of a magnetic field at a point can be detected by a compass needle.
Explanation:
In the presence of a magnetic field, the needle of compass rests only in the direction of magnetic field and in the absence of any magnetic field, the needle of compass can rest in any direction. In the earth's magnetic field alone, the needle rests along north-south direction.
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