Question

Calculate the force per unit length between two parallel long straight wires 2 cm apart in air, each carrying a current of 4 A.​

Answer 1

Explanation:

Given: i

1

=i

2

=5A;d=2.5cm=0.025m;l=10cm=0.10m

The magnetic force per unit length between two long straight parallel current carrying wires, placed in vacuum, separated by a distance d, is given by:

F/l=

2πd

μ

0

.i

1

i

2

F=

2πd

μ

0

.i

1

i

2

l

Hence, F=

2π×0.025

4π×10

−7

×5×5×0.10

=2.0×10

−5

N