Pre Video Test - Current ElectricityContact Number: 9667591930 / 8527521718

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Six equal resistance, each 4 $\mathrm{\Omega}$, make the arms of the given figure. The effective resistance between any two corners is

1. 10 $\mathrm{\Omega}$

2. (2/3) $\mathrm{\Omega}$

3. 4 $\mathrm{\Omega}$

4. 2 $\mathrm{\Omega}$

What is the potential difference between P and Q in the circuit shown in fig

1. 15 V

2. 10 V

3. 5 V

4. 2.5 V

In fig, the current in 3 $\mathrm{\Omega}$ resistance is

1. 1 A

2. $\frac{1}{7}A$

3. $\frac{5}{7}A$

4. $\frac{15}{7}A$

Seven identical cells each of emf E and internal resistance r are connected as shown. The potential difference between A and B is

1. 7 E

2. E

3. 6 E

4. zero

The given network in fig. is part of a larger circuit. The current through resistors are shown. The potential difference ${\mathrm{V}}_{\mathrm{P}}-{\mathrm{V}}_{\mathrm{Q}}$ is

1. -2 V

2. 19 V

3. 22 V

4. -19 V

The current drawn by the battery in the situation shown in fig

1. 2.5 A

2. 5 A

3. 7.5 A

4. 1 A

In fig. the current passing through 3 $\mathrm{\Omega}$ resistor is

1. $\frac{14}{3}A$

2. 3 A

3. 2 A

4. $\frac{12}{5}A$

The length of a potentiometer wire is l. A cell of emf E is balanced at a length l/3 from the positive end of the wire. If the length of the wire is increased by l/2, (without changing the potential difference across the wire), at what distance will the same cell give a balance point ?

1. 2 l/3

2. l/2

3. l/6

4. 4 l/3

There is an infinite wire grid with triangular units. The resistacne of each wire between neighbouring joints is equal to r. The equivalent resistance of the grid between the points A and B is

1. r/2

2. r/3

3. 2 r/3

4. r/6

In the circuit shown in fig. , what is the current in the 2 $\mathrm{\Omega}$ resistor ?

1. 2 A

2. 4 A

3. 6 A

4. 8 A

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