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The magnetic field at a distance r from a long wire carrying current i is 0.4 tesia. The magnetic field at a distance 2r is
(a) 0.2 tesla
(b) 0.8 tesla
(c) 0.1 tesla
(d) 1.6 tesla
(a)
When r is doubled, the magnetic field becomes half, i.e., now the magnetic field will be 0.2 T.
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