Across a metallic conductor of non uniform cross section, a constant potential difference is applied. The quantity which remains c..
When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is as follows. With the given ..
In the circuit shown below, ammeter & voltmeter readings are 3A & 6V. The value of resistance R will be
A Wire of certain material is stretched slowly by ten percent. Its new Resistance and specific Resistance becomes
When the current i is flowing through a conductor, the drift velocity is v. If 2i current is followed through the same metal havin..
A material B has twice the specific Resistance of A. A circular wire made of B has twice the diameter of a wire made of A. Having ..
Consider a copper wire of length L, cross section area A. It has n number of free electrons per unit volume. Which of the followin..
An electric circuit contains an operating heating element and a lit lamp. Which statement best explains why the lamp remains lit w..
Pick out the wrong feature about carbon resistors
For the circuit shown in the figure.
A 30 V, 90 W lamp is to be operated on a 120 V DC line. For proper glow, a resistor of .. should be connected in series with the l..
Equal amounts of a metal are converted into cylindrical wires of different lengths Land cross-sectional area A. The wire with the ..
An electric heater rated 220 V and 550 W is connected to AC mains. The current drawn by it is
An electric bulb marked as 50 W-200 V is connected across a 100 V supply. The present power of the bulb is
A lead acid battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.5 , the maximum current that can b..
The temperature of cold junction of thermocouple is 0 degree C. If the neutral temperature is 270 degree C, then the inversion tem..
A heater of 220 V heats a volume of water in 5 min. The same heater when connected to 110 V heats the same volume of water in (min..
A heater coil cut into two equal parts and one part is connected with heater. Now, heat generated in heater will be
An electric bulb is rated 220 V - 100 W. The power consumed by it when operated on 110 V will be
A 50 galvanometer gets full scale deflection when a current of 0.01 A pass through the coil. When it is converted to a 10 A ammete..
A 10 electric heater operates on a 110 V line. The rate at which heat is developed in watts is
A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity..
The power dissipated across resistance R which is connected across a battery of potential V is P. If resistance is doubled, then t..
In a thermocouple, the neutral temperature is 270 degree C and the temperature of inversion is 525 degree C. The temperature of co..
The temperature coefficient of resistance of a wire is 0.00125 per degree C. At 300 K, its resistance is 1 ohm. This resistance of..
A piece of copper and another of germanium are cooled from room temperature to 80 degree K. The resistance of
The electron dirft speed is small and the charge of the electron is also small but still, we obtain large current in a conductor. ..
Two electric bulbs marked 25 W-220 V and 100 W-200 V are connected in series to a 440 V supply. Which of the bulbs will fuse?
Heat is produced at a rate given by H in a resistor when it is connected across a supply of voltage V. If now the resistance of th..
A fuse wire with radius 1 mm blows at 1.5 A. The radius of the fuse wire of the same material to blow at 3 A will be
For a thermocouple, the inversion temperature is 600 degree C and the neutral temperature is 320 degree C. Find the temperature of..
A battery of emf E has an internal resistance r. A variable resistance R is connected to the terminals of the battery. A current i..
Resistance of a wire at 20 degree C is 20 and at 500 degree C is 60 . At what temperature its resistance is 25 ?
Find the true statement.
Consider a thin square sheet of side L and thickness t, made of a material of resistivity Ï. The resistance between two opposit..
In the circuit shown in fig the heat produced in the 5 ohm resistor due to the current flowing through it is 10 calories per secon..
The resistance of a wire is 5 at 50 degree C and 6 at 100 degree C. The resistance of the wire at 0 degree C will be
An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of th..
If a wire is stretched to make it 0.1% longer, its resistance will
The masses of the three wires of copper are in the ratio 5 : 3: 1 and their lengths are in the ratio 1 : 3 : 5. The ratio of their..
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