force between wires hard

Question

Two long parallel wires distance d carrying currents I in same direction exert force per unit length:

RankGuru · Accepted Answer

When two parallel wires carry current:
- Wire 1 produces field $B_1 = \frac{\mu_0 I}{2\pi d}$ at Wire 2.
- Wire 2 experiences force $F = I L B_1 \sin 90^\circ = I L (\frac{\mu_0 I}{2\pi d})$.
- Force per unit length $f = \frac{\mu_0 I^2}{2\pi d}$.
- Currents in the **same** direction **attract**.
- Currents in **opposite** directions **repel**.

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force between wires hard

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