The potential difference between the two end terminals of an electric heater is 220 V and the current through it is 0.5 A. What would be the current through the heater if the potential difference across the terminals of the heater is reduced to 120 V?

The heating element in an electric iron is usually made of

Sita, 1.5 m high, stands before a plane mirror fixed on a wall to view her full image. What should be the minimum height of the plane mirror so that Sita can view her image fully?

Which one of the following graphs correctly represents the current (I) - voltage (V) variation for a rectangular piece of a semiconductor wafer?