A long straight wire carrying current of 25A rests on a table as shown in Fig. 4.3. Another wire PQ of length 1m, mass 2.5 g carries the same current but in the opposite direction. The wire PQ is free to slide up and down. To what height will PQ rise?

Question

Philoid · Accepted Answer

Force on the small wire(PQ) due to the infinitely long wire is;

As we can direction for force we can consider the magnitude only. To sustain equilibrium, the condition needed is;

So,

m

=0.51 cm