Question

The wires which connect the battery of an automobile
tots starting motor carry a current of 300 A (for a short
me) What is the force between the wires if they are
70 cm long and 15 cm apart? is the force atractive or
repulsive​

Answer 1

Given:

Current through the wire, I = 300 A

Length of wire, L1 = 70 cm

Length of wire, L2 = 70 cm

Distance between the wires, d = 1.5 cm

force can be determined by ..........(1)

Here,  = 4π × 10^-7 , I = 300A

d = 1.5 cm = 1.5 × 10^-2 m = 0.015 m

now, F = (4π × 10^-7 × 300²)/(2π × 0.015)

F = (2 × 90000 × 10^-7)/(0.015)

F = 1.2 N/m

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please mark as the brainliest answer.