Which of the following are A possible sets of polarity when magnetising a steel bar PQ by the stroking method? (For magnets, N indicates north pole and S indicates south pole) (i) 1 = N, 2 = S, P=N, Q=S (ii) 1 = N. 2 = S, P=S. Q=N (iii) 1 - S, 2 = N, P = S, O = N (iv) 1 = S, 2 = N, P=N, Q=S
A
(i) and (ii) only
B
(iii) and (iv) only
C
(i) and (iii) only
D
(ii) and (iv) only
Text Solution
Verified by Experts
The correct Answer is:
D
According to single stroking method, pole 2 of bar magnet has same polarity as P of steel bar. As 2 and P have same polarity, so poles 1 and Q will also have same polarity, `:.` If 1 = N and 2 = S then P = S and Q = N. Similarly if 1 = S and 2 = N then P = N and Q = S.
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