Current Electri...

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

Two wires A and B of same material and same mass have radii 2r and r respectively. If resistance of wire A is 34 Ω, then resistance of B will be

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

Two different conductors have same resistance at 0°C. It is found that the resistance of the first conductor at t₁° C is equal to the resistance of the second conductor at t₂° C. The ratio of the temperature coefficients of resistance of the conductors, α₁/α₂ is

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 ofthe wire is 0.002 per °C]

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

The mobility of free electrons (charge e, mass m and relaxation time T) in a metal is proportional to

The resistance of a conductor is 5 ohm at 50°C and 6 ohm at 100°C. Its resistance at 0°C is

A block has dimensions 1 cm, 2 cm, 3 cm. Ratio of the maximum resistance to minimum resistance between any point of opposite faces of this block is