Question

An insulated copper wire is wound on a soft iron core. Current is passed through the coil such that at end ‘A’ the current flows anti- clockwise and a magnetic compass needle placed at other end ‘B’ of the coil.

i) What polarity is created at B?

ii) How is the magnetic compass affected when current flows through the coil?

• A. i) South Pole and ii) magnetic compass needle will deflect with its North pole towards B
• B. i) North Pole and ii) magnetic compass needle will deflect with its south pole towards B
• C. i) South Pole and ii) magnetic compass needle will deflect with its south pole towards B
• D. i) North Pole and ii) magnetic compass needle will deflect with its North pole towards A
• E. i) South Pole and ii) magnetic compass needle will not deflect

Answer 1

The correct option is A

i) South Pole and ii) magnetic compass needle will deflect with its North pole towards B

ii) At end B current flows clockwise thus end B becomes the South Pole.

ii) The compass needle deflects with its N-pole towards end ‘B’ as the end B is the South Pole.