Current Electricity questions
395 published questions with worked solutions.
- The Kirchhoff's first law ( i = 0) and second law ( iR = E), where the symbols have their usual meanings, are respectively based...
- In a Wheatstone's bridge, there resistances P, Q and R connected in the three arms and the fourth arm is formed by two...
- The resistance of a bulb filament is 100Ω at a temperature of 100^ . If its temperature coefficient of resistance be 0.005 per...
- An electric bulb is rated 220 volt −100 watt. The power consumed by it when operated on 110 volt will be
- If the ratio of the concentration of electrons that of holes in a semiconductor is 75 and the ratio of currents is 74, then what...
- This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best...
- Two conductors have the same resistance at 0°C but their temperature coefficients of resistance are _1 and _2. The respective...
- The relation between current and potential difference is given by
- When the potential difference applied across a solid conductor is increased, the rate of flow of electrons
- In case of liquids, the Ohm’s law is
- For the validity of Ohm’s law, which of the following quantity is constant ?
- In a closed circuit, the e. m. f. and internal resistance of the generator are E and r respectively. If the external resistance...
- An external resistance R is connected to a cell of internal resistance r. the current in the circuit is maximum when
- A conductor of length l and area of cross-section A has a resistance R then its specific resistance is
- The resistance of the material of unit length and unit area of cross section is
- If the length and area of cross section of a conductor are doubled, its resistance will be
- If ‘n’ is the number of free electrons in a metallic wire, then the resistance is proportional to
- The example of a non-ohmic resistance is
- If a wire of resistance 25 , is uniformly stretched until its length becomes three times its original length then its new...
- A wire of 50 cm long and 1 mm^2 in cross section carries a current of 4 A when connected to 2 V battery. The resistivity of the...
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