Physics

Question

What always produces a permanent bar

magnet?

A

an iron bar in a coil carrying alternating

current (a.c.)

an iron bar in a coil carrying direct current

B

(d.c.)

a steel bar in a coil carrying alternating

Current (a.c.)

a steel bar in a coll carrying direct current

(d.c.)

C

D

J14/1/30

Answer

A an iron bar in a coil carrying alternating current (a.c.)

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A permanent bar magnet is produced when an iron bar is placed in a coil carrying alternating current (a.c.). This is because the changing magnetic field...