Question

Through two parallel wires x and y, currents of 10 A and 2 A respectively are passed in opposite directions. x is infinitely long and y has a length of 2 m. The distance between them is 10 cm. the magnetic force on y is
1. 4 × 10^-5 N
2. 4 × 10^-6 N
3. 8 × 10^-5 N
4. 8 × 10^-6 N

Answer 1

Correct Answer - Option 3 : 8 × 10^-5 N

Magnetic force, \(F = \frac{{2 \times {{10}^{ - 7}} \times 10 \times 2 \times 2}}{{0.1}} = 8 \times {10^{ - 5}}\;N\)