The electric current in conductor is due to the flow of

Two wires A and B are made of copper both wires are 1m long but wire A is 1mm. thick and wire B is 2mm Thick. The specific resistance

The drift velocity of electrons is of the order of

The resistance of a wire is doubled if

The conductivity of a superconductor is

A 50 W, 220 V bulb and a 100 W, 220 V bulb are joined in series and connected to mains which bulb will glow brighter

No current flows between two charged bodies when connected if they have same:

A flow of 10¹² electron per second in a conductor constitutes a current of

Combining the ten resistances each of value 1/5 ohm, the maximum resistance that can be obtained is

Two bulbs having the ratings 40W, 220V and 20 W, 110 V. The ratio of their resistance is

What is the voltage across a 6 Ω resistor when 3A of current passes through it?

A resistor connected to battery is heated due to current through it. Which of the following quantity does not vary?

The ‘emf’ is always even when no current is drawn through the battery of cell.

What is the power rating of a lamp connected to a 12V source when it carries a current of 2.5A?

The resistance of a wire is R. It is stretched uniformly so that its length is doubled The resistance now becomes

Graph between V and I for non-ohmic devices

The combine resistance of two conductors is 10Ω, when they are in series and in parallel combinations their equivalent is 2.4 Ω, the resistance of two conductors is

Combined resistance of two identical resistors in series is 16Ω. If they are connected in parallel then equivalent resistance is

A cell supplies a current 0.9A through 2 Ω resistance and a current 0.3A through 7 Ω resistance. The internal resistance of cell is

A wire of uniform area of cross section is cut into two parts of equal lengths. The resistivity of any part

Internal resistance of ideal current source is

Which of the following has volt as its unit

The resistance of a bulb filament is 100 Ω at a temperature of 100°C. If its temperature coefficient of resistance be 0.005 per °C, its resistance will become 200 Ω at a temperature of

If the temperature of a conductor is increased, the drift velocity

A cell is connected to a resistor. What is the e.m.f of the cell equal to?

The potential difference between the ends of a conductor is 12 V. How much electrical energy is converted to other forms of energy in the conductor when 100 C of charge flows through it?

When the resistors are connected in series the equivalent resistance is equal to

When the resistors are connected in series, then the physical quantity which remains constant

The resistances of 2 ohms and 4 ohms are connected in parallel, the equivalent resistance will be

Which combination of seven identical resistors each of 2Ω gives rise to the resultant of 10/11Ω?

The circuit shown, the voltmeter has infinite resistance

What is the voltmeter reading?

Two resistances r1 and r2 (r1 < r2) are connected in series. The equivalent resistance R is

N resistors each of resistance R their equivalent resistance in parallel and series combinations are R_P and R_S. What is their ratio R_P:R_S

A circuit is set up as shown in the diagram.

Assuming that the ammeter has negligible resistance, what is the value of the resistor R?

A cell of emf E Volt and internal resistance r ohm is being charged with a current of

i amp. Then the terminal potential difference is

Maximum power is delivered by battery to a load resistance R when