Question

Manav made an electric circuit & placed a magnetic compass near it.
(a) On switching on, the needle of the magnetic compass showed a deflection Why?

(b) On switching off, the needle came back to its normal north-south direction. Why

Answer 1

Explanation:

1.Because the electric circuit reflects magnetic energy making the compass to deflect

Answer 2

Answer:

Electric circuit reflects energy to deflect.

Explanation:

When a magnetic compass is brought close to a current carrying wire there is deflection in the compass due to the formation of magnetic field. The magnetic field lines around a long wire which carries an electric current form concentric circles around the wire. The direction of the magnetic field is perpendicular to the wire.

The deflection increases when the current is increased because the magnitude of the field is directly proportional to the strength of the electric current. That is, stronger the electric field, stronger the magnetic field.