Subject :NSO Class : Class 7
Which of the following statements is/are correct?
I. A bar magnet becomes weak if broke along its length.
II. If a bar magnet is broken into two pieces, total number of north pole becomes 4.
III. Magnetism is induced in iron nail placed near magnet.
IV. Magnetic effect cannot pass through non-magnetic substance.
AII and IV only
BI only
CI, III and IV only
DI, II, III and IV