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 ..
Resistance of a wire at 20 degree Celsius is 20 Ohm & at 500 degree Celsius is 60 Ohm. At what temperature is its Resistance 25 O..
In the circuit shown below, ammeter & voltmeter readings are 3A & 6V. The value of resistance R will be
A railway compartment is lit up by thirteen lamps each taking 2.1 A at 15 V. The heat generated per second in each lamp will be
A Wire of certain material is stretched slowly by ten percent. Its new Resistance and specific Resistance becomes
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 ..
Across a metallic conductor of non uniform cross section, a constant potential difference is applied. The quantity which remains c..
When the current i is flowing through a conductor, the drift velocity is v. If 2i current is followed through the same metal havin..
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..
For the circuit shown in the figure.
An electric heater rated 220 V and 550 W is connected to AC mains. The current drawn by it is
for current entering at a. the electronic field at a distance
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..
An electric bulb marked as 50 W-200 V is connected across a 100 V supply. The present power of the bulb is
Equal amounts of a metal are converted into cylindrical wires of different lengths Land cross-sectional area A. The wire with the ..
An electric circuit contains an operating heating element and a lit lamp. Which statement best explains why the lamp remains lit w..
An electric bulb is rated 220 V - 100 W. The power consumed by it when operated on 110 V will be
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..
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?
Pick out the wrong feature about carbon resistors
The temperature of cold junction of thermocouple is 0 degree C. If the neutral temperature is 270 degree C, then the inversion tem..
A piece of copper and another of germanium are cooled from room temperature to 80 degree K. The resistance of
A heater coil cut into two equal parts and one part is connected with heater. Now, heat generated in heater 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
For a thermocouple, the inversion temperature is 600 degree C and the neutral temperature is 320 degree C. Find the temperature of..
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..
In a thermocouple, the neutral temperature is 270 degree C and the temperature of inversion is 525 degree C. The temperature of co..
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..
The electron dirft speed is small and the charge of the electron is also small but still, we obtain large current in a conductor. ..
Find the true statement.
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
The power dissipated across resistance R which is connected across a battery of potential V is P. If resistance is doubled, then t..
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..
Resistance of a wire at 20 degree C is 20 and at 500 degree C is 60 . At what temperature its resistance is 25 ?
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..
Consider a thin square sheet of side L and thickness t, made of a material of resistivity Ï. The resistance between two opposit..
If a wire is stretched to make it 0.1% longer, its resistance will
A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity..
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