Current Electri...

In a neon discharge tube 2.9 × 10¹⁸ Ne⁺ ions move to the right each second while 1.2 × 10¹⁸, electrons move to the left per second. Electron charge is 1.6 × 10^–19 C. The current in the discharge tube

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are

The resistivity of alloys = R_alloy; the resistivity of constituent metals R_metal. Then, usually

Two rods of same material and length have their electric resistances in ratio 1:2. When both rods are dipped in water, the correct statement will be

The resistance of a wire at room temperature 30° C is found to be 10 Ω. Now to increase the resistance by 10%, the temperature of the wire must be [The temperature coefficient of resistance of the material of the wire is 0.002 per °C]

The colour code for a resistor of resistance 3.5k Ω with5% tolerance is

A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by v_P and v_Q respectively,then

If an electric current is passed through a nerve of a man, then man

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

Conductivity increases in the order of