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A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying same current. The strength of magnetic field far away is
(a) Twice the earlier value
(b) Same as the earlier value
(c) One-half of the earlier value
(d) One-quarter of the earlier value
(b)
The current is same in both the wire, hence magnetic field induced will be same.
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