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At what distance from a long straight wire carrying a current of 12 A will the magnetic field be equal to 3 × 10 -6 Wb/m 2 ? (a) 5 × 10 -2 m (b) 12 × 10 -2 m (c) 18 × 10 -2 m (d) 24 × 10 -2 m



At what distance from a long straight wire carrying a current of 12 A will the magnetic field be equal to 3 × 10-6 Wb/m2?


        (a)    5 × 10-2 m


        (b)    12 × 10-2 m


        (c)    18 × 10-2 m       


(d)    24 × 10-2 m


Grade:upto college level

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
8 years ago

(a)

Current (I) = 12 A and magnetic field (B)

= 3 × 10-5 Wb/m2.

Consider magnetic field  at distance r.

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