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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
- twice the earlier value
- same as the earlier value
- one-half of the earlier value
- one-quarter of the earlier value
Correct answer: same as the earlier value
Solution
The magnetic field at a point far away from a current-carrying wire depends only on the current and not on the diameter of the wire. Since the current remains the same, the magnetic field strength will also remain the same.
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