JEE Main · PhysicsHard
Two parallel wires separated by distance $d$ carry currents $I_1$ and $I_2$ in the same direction. What is the force per unit length $f$ between them?
- A.$\frac{\mu_0 I_1 I_2}{2\pi d}$
- B.$\frac{\mu_0 I_1 I_2}{\pi d}$
- C.$\frac{\mu_0 I_1 I_2}{4\pi d}$
- D.$\frac{2\mu_0 I_1 I_2}{\pi d}$
Show correct answer & step-by-step solution
Correct answer: A — $\frac{\mu_0 I_1 I_2}{2\pi d}$
Solution
The magnetic field from wire 1 at distance is . The force per unit length on wire 2 is .
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