Current Electri...

Two cells of 1.25 V and 0.75 V are connected in series with anode of one connected to anode of the other . The effective voltage will be

In a potentiometer experiment, for measuring internal resistance of a cell, the balance point has been obtained on the fourth wire. The balance point can be shifted to fifth wire by

A battery is connected with a potentiometer wire. The internal resistance of the battery is negligible. If the length of the potentiometer wire of the same material and radius is doubled then

The terminal potential difference of a cell is greater than its e.m.f. when it is

The instrument for the accurate measurement of the e.m.f of a cell is

The resistivity of a wire depends upon 

A current of 2 A flows in conductors as shown. The potential difference V_A - V_B will be

Directions: The following question has four choices out of which ONLY ONE is correct.

It is easier to start car engine on a hot day than on a cold day. This is because the internal resistance of the car battery  

An electric cell is

Specific resistance of all metals is most affected by

The resistance of a wire of length L is R. If the wire is stretched to increase its length to 4L, then what will be the new resistance of the wire?

Directions: The following question has four choices out of which ONLY ONE is correct.

The electrical intensity E, current density J and specific resistance ρ are related to each other through the relation

A uniform wire of resistance R and length L is cut into four equal parts of length L/4 and then connected in parallel combination. What will be the effective resistance of the combination?

If a circuit containing two unequal resistors is connected in parallel,

Directions: The following question has four choices out of which ONLY ONE is correct.

A teacher asked a student to connect 'N' cells, each of emf 'e' in series to get a total emf of 'Ne'. While connecting, the student, by mistake, reversed the polarity of 'n' cells. Find the total emf of the resulting series combination.

Directions: The following question has four choices out of which ONLY ONE is correct.

Ohm`s law is the relation between

Directions: The following question has four choices out of which ONLY ONE is correct.

Which of the following is an example of non-ohmic resistance?

In the electric circuit shown, Three cells each cell has an emf of 2V and internal resistance of 1 connected in series . The external resistance is 2. The value of the current I is (in amperes)

 

A wire has radius r having resistance R , when a wire is stretched and its radius becomes r/2, then its resistance will be

Which of the following setups can be used to verify Ohm's law?

Therefore, the red colour will emerge first after travelling through the slab.

Potentiometer measures the potential difference more accurately than a voltmeter, because

Kirchhoff’s second law is a consequence of

Fuse wire is an alloy of

It is observed in a potentiometer experiment that no current passes through the galvanometer, when the terminals of the cell are connected across a certain length of the potentiometer wire. On shunting the cell by a 2 Ω resistance, the balancing length is reduced to half. The internal resistance of the cell is

What is the equivalent resistance across A and B?

A parallel combination of two resistors, of 1 ohm each, is connected in series with a 1.5 ohm resistor. The total combination is connected across a 10 V battery. The current flowing in the circuit is

The sensitivity of the potentiometer can be increased by:

Directions: The following question has four choices out of which ONLY ONE is correct.

Melting point of fuse wire should be

Two wires with the same dimensions and resistivities ₁ and ₂ are connected in series. The equivalent resistivity of the combination is