Question

A power line lies along the east - west direction and carries a current of 10 A.

The force per meter due to earth's magnetic field of 10-4

T is 10-X N/m. The value

of x is_____________.​

Answer 1

Answer:

3

Explanation:

We know, F=Bil

F/l = Bi........(i)

where, F is force experienced by the wire, B is value of magnetic field, i is current flowing through the wire and l is the length of wire.

F/l = 10^(-x) N/m

B = 10^(-4) T

i = 10 A

Putting these values in (i)

10^(-x) = 10^(-4) × 10

10^(-x) = 10^(-4+1)

10^(-x) = 10^(-3)

Comparing,

-x=-3

x=3

So, the value of x=3.

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