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42 A straight wire of a diameter 0 5 mm carrying a current of 1...

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42 A straight wire of a diameter 0 5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current The strength of the magnetic field far away is 1 One quarter of the earlier value 2 No change 3 Twice the earlier value 4 One half of the earlier value

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