Physics

Problem

A horizontal wire

PQ

of length

1\,\text{m}

is suspended from a spring of spring constant

k = 100\,\text{N/m}

. Another wire

RS

is fixed vertically below

PQ

at a distance of

1\,\text{cm}

. Initially, with no current, the system is in equilibrium. When equal currents

I

pass through both wires in the same direction, the spring stretches by an additional

1\,\text{mm}

(

0.001\,\text{m}

). Calculate the magnitude of the current

I