Question

If the radius of the current carrying conductor increases, what is the effect on the force?

(a) increases

(b) decreases

(c) remain same

(d) become zero

I had been asked this question by my college professor while I was bunking the class.

I'm obligated to ask this question of Magnetic Field Due to an Electric Current topic in division Electromagnetism of Basic Electrical Engineering

Answer 1

The correct choice is (c) remain same

For explanation I would say: Force of the infinite conductor is given by Bil if B, i, l are mutually perpendicular

F/l = Bi = µ0i1i2/2πd if d is separation of two infinite parallel conductors. It doesn’t depend on the radius of conductor so force remains the same.