Question

Take two different coils of copper wire having large number of turns, say 50 and 100 turns respectively. Insert them over a non-conducting roll as shown in the given figure. Connect the Coil-1, having large number of turns, in series with a battery and a plug key. Also connect the other Coil-2 with a galvanometer.

Kanika and Himani have set up two coils P and Q as shown below. The only difference between the two set-ups is the source of electricity. State what will the galvanometer indicate when the switch is closed in both the set-ups.

An induction cooktop works on the principle of electromagnetic induction. Inside the cooktop there is a tightly wound metal coil. An alternating current flows through the coil and produces an invisible, high-frequency, alternating magnetic field all around it. When a vessel made of magnetic material is placed on the cooktop, the magnetic field produced by the coil penetrates the iron of the vessel and induces whirling electrical (eddy) currents inside the pan and makes it hot. There is no open flame used. Heat from the pan flows directly into the food or water inside it (by conduction) without heating up the area surrounding the cooktop. Unless there is a pan on the cooktop, no heat is produced. List any two advantages, with reasons, of cooking using an induction cooktop instead of a gas stove.

A coil is connected to a galvanometer as shown in the image below. The galvanometer shows a deflection to the right when the north pole of a magnet is moved towards the coil. State the deflection in the galvanometer when both the coil and the magnet are moved towards the right at the same speed. Give a reason for your answer.