Physics
A conductor AB is kept along north south direction of the earth above a magnetic needle as shown below. When the key K is closed then:
- the needle will not show any deflection.
- the needle will deflect towards east.
- the needle will turn in the opposite direction i.e. towards south.
- the needle will deflect towards west.
Electro-Magnetism
ICSE 2022
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Answer
the needle will deflect towards east.
Reason — As the key is closed, a current will flow through the wire and a magnetic field will be produced. In interaction with the earth’s magnetic field the resultant magnetic field will defect the needle towards east.
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