Magnetic Force Between Parallel Currents Video Lessons

Concept

# Problem: The force per meter between the two wires of a jumper cable being used to start a stalled car is 0.225 N/m a. What is the current in the wires, given they are separated by 2.00 cmb. Is the force attractive or repulsive

###### FREE Expert Solution

Magnetic force per unit length between two parallel conductors:

$\overline{)\frac{\mathbf{F}}{\mathbf{l}}{\mathbf{=}}\frac{{\mathbf{\mu }}_{\mathbf{0}}{\mathbf{i}}_{\mathbf{1}}{\mathbf{i}}_{\mathbf{2}}}{\mathbf{2}\mathbf{\pi }\mathbf{r}}}$, where i1 and i2 are the currents in the two parallel wires, r is the distance between the parallel wires, and μ0 is the permeability of free space.

a.

Both the wires have the same magnitude of the current.

i1 = i2 = i

###### Problem Details

The force per meter between the two wires of a jumper cable being used to start a stalled car is 0.225 N/m

a. What is the current in the wires, given they are separated by 2.00 cm

b. Is the force attractive or repulsive