Question

A power line lies along the east-west direction and carries a current of 10 ampere . The force per metre due to the earth's magnetic field of 10¯⁴ tesla is:

✌JEE ✌​

Answer 1

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$\bf\huge\boxed{10^-^3}$

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Given—

Current = 10 Ampere

The magnetic feild of 10¯⁴ tesla

F = B × I × L × sinA

Where, B is the magnetic field, I is the current,L is the length of wire and A is the angle between the magnetic field and the current flow.

Now,

A =90 ° as the south-westward direction which is perpendicula to the earth magnetic field.

L = 1

Thus the required force,

F = B × I = 0.001 × 10 = 10¯³ N

$\huge{\red{\ddot{\smile}}}$