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.
for current entering at a. the electronic field at a distance
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 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..
A piece of copper and another of germanium are cooled from room temperature to 80 degree K. The resistance of
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..
An electric circuit contains an operating heating element and a lit lamp. Which statement best explains why the lamp remains lit w..
Equal amounts of a metal are converted into cylindrical wires of different lengths Land cross-sectional area A. The wire with the ..
An electric bulb is rated 220 V - 100 W. The power consumed by it when operated on 110 V will be
For a thermocouple, the inversion temperature is 600 degree C and the neutral temperature is 320 degree C. Find the temperature of..
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
A heater coil cut into two equal parts and one part is connected with heater. Now, heat generated in heater will be
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 of cold junction of thermocouple is 0 degree C. If the neutral temperature is 270 degree C, then the inversion tem..
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..
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..
The electron dirft speed is small and the charge of the electron is also small but still, we obtain large current in a conductor. ..
A 10 electric heater operates on a 110 V line. The rate at which heat is developed in watts is
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
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..
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.
An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths 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..
If a wire is stretched to make it 0.1% longer, its resistance will
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
Ohms Law is valid if
A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity..
Consider a thin square sheet of side L and thickness t, made of a material of resistivity Ï. The resistance between two opposit..
Which of the following is a vector quantity
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..
By increasing the temperature, the specific Resistance of a conductor and a semi conductor
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..
Electric field and current density have the relation
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