Question

Two parallel conductors carrying current of 4.0 A and 10.0 A are placed 2.5 cm apart in vacuum. The force per unit length between them is ______.

Options

• 6.4 × 10⁻⁵ N/m

• 6.4 × 10⁻² N/m

• 4.6 × 10⁻⁴ N/m

• 3.2 × 10⁻⁴ N/m

Answer 1

Two parallel conductors carrying current of 4.0 A and 10.0 A are placed 2.5 cm apart in vacuum. The force per unit length between them is 3.2 × 10⁻⁴ N/m.

Explanation:

`F = (mu_0 i_1 i_2)/(2 pi r)`

= `(4 pi xx 10^-7 xx 4 xx 10)/(2 pi xx 2.5 xx 10^-2)`

= 3.2 × 10⁻⁴ N/m