Inducing an electric current You decide to use a metal ring as an indicator o...

Inducing an electric current

You decide to use a metal ring as an indicator of induced current. If there is a current, the ring will feel warm in your hand. You place the ring around a solenoid, as shown in Figure P18.3. (a) Will the ring feel warm if there is constant nonzero current in the solenoid? (b) Will the ring feel warm if the current in the solenoid is alternating? Explain your answers.