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  • A power line lies along the east-west direction and carries a current of   The force

A power line lies along the east-west direction and carries a current of 10 \mathrm{~A}  The force per metre due to the earth's magnetic field of  10^{-4} \mathrm{~T} is

Option: 1

10^{-5} \mathrm{Nm}^{-1}


Option: 2

10^{-4} \mathrm{Nm}^{-1}


Option: 3

10^{-3} \mathrm{Nm}^{-1}


Option: 4

10^{-2} \mathrm{Nm}^{-1}


Answers (1)

best_answer

Force F on a wire of length l

F=B I l.

Therefore, the force per unit length of the wire {=\frac{F}{l}=B I=10^{-4} \times 10= ~10^{-3} \mathrm{Nm}^{-1}}

  which is choice (c).

Posted by

Riya

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