Recent questions tagged chapter3

0 votes

0 answers

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` is drawn from the battery. V is the terminal potential difference. If R alone is gradually reduced to zero, which of the following best describes `i and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A cell of emf (E) and internal resistance r is connected across a variable external resistance R . The graph of terminal potential difference V as a function of R

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

In the electric circuit shown, each cell has an emf of `2 V` and internal resistance is `1Omega` . The external resistance is `2Omega`. The value of the current `I` is (in

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Consider first two cells in series as shown in figure. The potential difference between the terminals A and C of the combination

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

In the circuit shown in figure, `E_1=10V, E_2=4 V , r_1 = r_2 = 1Omega and R = 2Omega` Find the potential difference across battery 1 and battery

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Under what conditions current passing through the resistance R can be increased by short circuiting the battery of emf `E_2` ? The internal resistances of the two batteries are `r_1 and r_2`,

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

12 cells, each of emf `1.5 V` and internal resistance of `0.5 Omega`, are arranged in `m` rows each containing `n` cells connected in series, as shown in the figure.Calculate the values of `n and m` for which this combination would send maximum current through an external resistance of `1.5

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

According to Kirchhoff’s current law as applied to a junction in a network of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Five conductors are meeting at a point `x` as shown in the figure. What is the value of current in fifth

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The currents `i_1 and i_2` through the resistors `R_1(=10 Omega) and R_2 (= 30 Omega)` in the circuit diagram with `E_1= 3 V, E_2 = 3 V and E_3 = 2 V` are

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The algebraic sum of voltages around any closed path in a network is equal

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The potential difference `(V_A - V_B)` between the points A and B in the given figure

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

If `2A` current is flowing in the shown circuit, then potential difference `(V_B - V_D)` in balanced condition

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

In a Wheatstone bridge circuit, `P=7 Omega, Q= 8 Omega, R = 12 Omega and S = 7 Omega`. Find the additional resistance to be used in series with `S` , so that the bridge is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A meter bridge is set up as shown in figure, to determine an unknown resistance `X` using a standard `10 Omega` resistor. The galvanometer shows null point when tapping key is at `52 cm` mark. The end-corrections are `1 cm and 2 cm` respectively for the ends A and B. The determined value of `X`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The figure below shows a `2.0 V` potentiometer used for the determination of internal resistance of a `2.5 V` cell. The balance point of the cell in the open circuit is 75 cm. When a resistor of `10 Omega` is used in the external circuit of the cell, the balance point shifts to 65 cm length of potentiometer wire. The internal resistance of the cell

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A potentiometer circuit is set up as shown. The potential gradient across the potentiometer wire, is `k` volt/cm and the ammeter, present in the circuit, reads `1.0` A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths `l_1 cm and l_2 cm`, respectively. The magnitudes of the resistors `R and X` in ohm, are then, respectively equal

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

`10 A` current passes through a copper. The net charge after `5s` in the wire

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Au is a highly conductive metal which obeys Ohm’s law but................does not obey Ohm’s law due to lack of conduction

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

During charging of a cell terminal voltage i s ................ than emf of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

Recent questions tagged chapter3

Categories