Current Electricity · Question 2

Two cells of emfs 1 V and 2 V and internal resistance 2 and 1 , respectively connected in parallel, gave a current of 1 A through an external resistance. If the polarity of one cell is reversed, then value of current through the external resistance will be 5 A. The value of is .

Refer to the figure given below. The values of I1, I2 and I3 are . [figure]

1. I1=2.5 A, I2=1.875 A, I3=1.875 A
2. I1=1.875 A, I2=2.5 A, I3=1.875 A
3. I1=1.875 A, I2=1.875 A, I3=2.5 A
4. I1=2.5 A, I2=2.5 A, I3=1.875 A

Refer to the figure given below, current between terminals A and B is A. [figure]

1. 12.5
2. 1.25
3. 7.5
4. 5

Under steady state condition the potential difference across the capacitor in the circuit is V. [figure]

1. 0.5
2. 1.5
3. 0
4. 2

When an external resistance of 5 is connected across terminals of a cell, a current of 0.25 A flows through it. When the 5 resistor is replaced by a 2 resistor, a current of 0.5 A flows through it. The internal resistance of the cell is .

The voltage and the current between A and B points shown in the circuit are . [figure]

1. 24 V, 12 A
2. 24 V, 4 A
3. 18 V, 12 A
4. 27 V, 4 A

Two resistors of 200 Ω and 400 Ω are connected in series with a battery of 100 V. A bulb rated at 200 V, 100 W is connected across the 400 Ω resistance. The potential drop across the bulb is V.

1. 25
2. 50
3. 66.6
4. 100

For the two cells having same EMF E and internal resistance r, the current passing through the external resistor 6 is same when both the cells are connected either in parallel or in series. The value of internal resistance r is .

1. 3
2. 6
3. 4
4. 9

In the potentiometer, when the cell in the secondary circuit is shunted with 4 resistance, the balance is obtained at the length 120 cm of wire. Now when the same cell is shunted with 12 resistance, the balance is shifted to a length of 180 cm. The internal resistance of cell is

1. 4
2. 12
3. 6
4. 3

The equivalent resistance between the points A and B in the following circuit is x5 . The value of x is . [figure]