In the circuit shown, the value of each of the resistances is r.  The equivalent resistance of the circuit between terminals A and B will be:
        
1. (4/3)r

2. 3r/2

3. r/3

4. 8r/7

Drift velocity v_d varies with the intensity of electric field as per the relation: 

1. $v_d\propto E$

2. $v_d\propto \frac{1}{E}$

3. v_d = constant

4. $v_d\propto E^2$ 

What is the equivalent resistance of the circuit​​​​​​?

1. 6 Ω

2. 7 Ω

3. 8 Ω

4. 9 Ω

Equivalent resistance across terminals A and B will be:

1. 1 Ω

2. 2 Ω

3. 3 Ω

4. 4 Ω

The total current supplied to the circuit by the battery is:

1. 1 A

2. 2 A

3. 4 A

4. 6 A

A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown below. Which one of the following is true​​​​​​?

The current in the arm CD of the circuit will be:
           
1. $i_1+i_2$

2. $i_2+i_3$

3. $i_1+i_3$

4. $i_1-i_2+i_3$

A resistance of 4 Ω and a wire of length 5 metres and resistance 5 Ω are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1 Ω. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is:

1. 1.5 V

2. 3.0 V

3. 0.67 V

4. 1.33 V

The potential difference across 8 ohms resistance is 48 volts as shown in the figure below. The value of potential difference across X and Y points will be:

1. 160 volt

2. 128 volt

3. 80 volt

4. 62 volt

The effective resistance between points P and Q of the electrical circuit shown in the figure is:
            

1. $2Rr/(R+r)$

2. $8R$ $(R+r)/(3R+r)$

3. $2r+4R$

4. $5R/2$ $+$ $2r$