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
Pick out the wrong feature about carbon resistors
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
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
A piece of copper and another of germanium are cooled from room temperature to 80 degree K. The resistance of
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..
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?
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..
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
In a thermocouple, the neutral temperature is 270 degree C and the temperature of inversion is 525 degree C. The temperature of co..
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.
The power dissipated across resistance R which is connected across a battery of potential V is P. If resistance is doubled, then t..
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 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 ?
An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of th..
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
Consider a thin square sheet of side L and thickness t, made of a material of resistivity Ï. The resistance between two opposit..
A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity..
If a wire is stretched to make it 0.1% longer, its resistance will
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..
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..
Ohms Law is valid if
Which of the following is a vector quantity
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..
By increasing the temperature, the specific Resistance of a conductor and a semi conductor
Electric field and current density have the relation
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