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Popular Questions
- Across a metallic conductor of non uniform cross section, a constant potential difference is applied. The quantity which remains c..
- 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..
- 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 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..
- 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 ..
- A 10 electric heater operates on a 110 V line. The rate at which heat is developed in watts is
- An electric circuit contains an operating heating element and a lit lamp. Which statement best explains why the lamp remains lit w..
- For the circuit shown in the figure.
- 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..
- 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..
- The resistance of a 10 m long wire is 1 . Its length is increased by 25% by stretching the wire uniformly. Then, the resistance of..
- An electric heater rated 220 V and 550 W is connected to AC mains. The current drawn by it is
- 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..
- 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
- An electric bulb marked as 50 W-200 V is connected across a 100 V supply. The present power of the bulb is
- A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity..
- An electric bulb is rated 220 V - 100 W. The power consumed by it when operated on 110 V will be
- A heater coil cut into two equal parts and one part is connected with heater. Now, heat generated in heater will be
- Find the true statement.
- 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..
- Pick out the wrong feature about carbon resistors
- A piece of copper and another of germanium are cooled from room temperature to 80 degree K. The resistance 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?
- The temperature of cold junction of thermocouple is 0 degree C. If the neutral temperature is 270 degree C, then the inversion tem..
- 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 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..
- 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. ..
- For a thermocouple, the inversion temperature is 600 degree C and the neutral temperature is 320 degree C. Find the temperature 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 ?
- A moving coil galvanometer has 150 equal division. its current
- The power dissipated across resistance R which is connected across a battery of potential V is P. If resistance is doubled, then t..
- two voltmeter one of copper and another is silver
- 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
- 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..
- 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..
- An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of th..
- an immersion heater is rated 836 watt. it should heat 1
