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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



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


Grade:upto college level

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
7 years ago

(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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