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The resistance of two resistors is S in series combination, when they are joined in parallel, the total resistance is P. If S = nP, then the minimum possible value of n is?
The thermistors are usually made of?
The length of a given cylindrical wire is increased by 100 %. Due to this decrease in its diameter, the change in the resistance of the wire will be
An ammeter reads upto 1 ampere Its internal resistance 0.81 ohm. To increase the range to 10 ampere, the value of the required shunt is
The resistance of a coil at 100 °C is 4.2 Ω. If temperature coefficient of resistance is 0.004 / °C, then its resistance at 0 °C is
A steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantity is constant along the conductor ?
If the change in resistance of a copper wire on stretching is 0.4 %, then its length is stretched by what percentage?
The resistance of 20 cm long wire is 5 Ω. If it is stretched to 40 cm length, the new resistance in ohm will be?
Masses of the three copper wires 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 will be?