A plate composed of welded sheets of aluminium and iron is connected to an electrical circuit as shown in figure. What will happen if a fairly strong current to be passed through the circuit?

Options

A. Strip bends upward
B. Strip bends downward
C. Strip remains in its initial condition
D. None of the above

Answer

A

Explanation

When current is passing through the strip, the temperature of strip increases. So, thermal expansion takes place in the strip. Since the value of `alpha` for Iron is lesser than that of aluminium. So, strip bends upwards.