Moving Charges and Magnetism: RE-NEET 2026

Medium· Force between Two Parallel Currents· +4 / −1

Two infinitely long parallel conducting wires

A

and

B

carry currents

I

and

2I

, respectively, in the same direction. The wire

A

has uniform mass per unit length

\lambda

and lies on an insulated floor. The wire

B

is kept fixed at a height

h

above the floor. The minimum magnitude of

h

so that the wire

A

does not rise from the floor is: [

g

is the acceleration due to gravity and

\mu_0

is the permeability of free space.]

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