Current Electricity

Related Questions

• A copper wire of length 1 m and radius 1 mm is joined in series with an iron wire of length 2 m and radius 3 mm and a current is passed through the wires. The ratio of the current density in the copper and iron wires is

  ---

• The resistance of an ideal voltmeter is

  ---

• A 100 watt bulb working on 200 volt and a 200 watt bulb working on 100 volt have

  ---

• The equivalent resistance of the arrangement of resistances shown in adjoining figure between the points A and B is

  ---

• Masses of three wires of copper are in the ratio of $1 : 3 : 5$ and their lengths are in the ratio of 5:3:1. The ratio of their electrical resistances are

  ---