Equivalent resistance between the points A and B is (in Ω) 

  • 15

  • 114

  • 213

  • 312

In the circuit shown here, what is the value of the unknown resistor R so that the total resistance of the circuit between points P and Q is also equal to R 

  • 3 ohms

  • 39 ohms

  • 69 ohms

  • 10 ohms

The resistors of resistances 2 Ω, 4 Ω and 8 Ω are connected in parallel, then the equivalent resistance of the combination will be :

  • 87Ω

  • 78Ω

  • 74Ω

  • 49Ω 

In the circuit, the potential difference across PQ will be nearest to 

  • 9.6 V

  • 6.6 V

  • 4.8 V

  • 3.2 V

Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms, 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be 

  • 32

  • 64

  • 50

  • 200

Find the equivalent resistance across AB.

  • 1 Ω

  • 2 Ω

  • 3 Ω

  • 4 Ω

Two wires of the same dimensions but resistivities ρ1 and ρ2 are connected in series. The equivalent resistivity of the combination is 

  • ρ1 + ρ2

  • ρ1+ρ22

  • ρ1ρ2

  • 2(ρ1+ρ2)

A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be 

  • 1/3 A

  • 1 A

  • 1.5 A

  • 2 A

Find the equivalent resistance between the points a and b 

  • 2 Ω

  • 4 Ω

  • 8 Ω

  • 16 Ω

The potential difference between point A & B is 

  • 207  V

  • 407  V

  • 107  V

  • 0

In the circuit shown below, The reading of the voltmeter V is 

  • 12 V

  • 8 V

  • 20 V

  • 16 V

In the circuit shown in the figure, the current flowing in 2 Ω resistance 

  • (1) 4 A

  • (2) 1.2 A

  • (3) 0.4 A

  • (4) 1.0 A

In the figure given the value of X resistance will be, when the p.d. between B and D is zero 

  • 4 ohm

  • 6 ohm

  • 8 ohm

  • 9 ohm

Five resistors of given values are connected together as shown in the figure. The current in the arm BD will be 

  • Half the current in the arm ABC

  • Zero

  • Twice the current in the arm ABC

  • Four times the current in the arm ABC

In the network shown in the figure, each of the resistance is equal to 2 Ω. The resistance between the points A and B is 

  • 1 Ω

  • (4) 2 Ω

  • 3 Ω

  • (2) 4 Ω

In the arrangement of resistances shown below, the effective resistance between points A and B is

  • 20 Ω

  • 30 Ω

  • 90 Ω

  • 110 Ω

In the Wheatstone's bridge shown, P = 2 Ω, Q = 3 Ω, R = 6 Ω and S = 8 Ω. In order to obtain balance, shunt resistance across 'S' must be [SCRA 1998]

  • 2 Ω

  • 3 Ω

  • 6 Ω

  • 8 Ω

Potential difference between the points P and Q in the electric circuit shown is 

  • 4.5 V

  • 1.2 V

  • 2.4 V

  • 2.88 V

In a typical Wheatstone network, the resistances in cyclic order are A = 10 Ω, B = 5 Ω, C = 4 Ω and D = 4 Ω for the bridge to be balanced 

  • 10 Ω should be connected in parallel with A

  • 10 Ω should be connected in series with A

  • 5 Ω should be connected in series with C

  • 5 Ω should be connected in parallel with B

In the circuit shown in figure, the current drawn from the battery is 4A. If 10 Ω resistor is replaced by 20 Ω resistor, then current drawn from the circuit will be 

  • 1 A

  • 2 A

  • 3 A

  • 4 A

If each of the resistance of the network shown in the figure is R, the equivalent resistance between A and B is 

  • 5 R

  • 3 R

  • R

  • R/2

Thirteen resistances each of resistance R ohm are connected in the circuit as shown in the figure below. The effective resistance between A and B is 

  • 2R Ω

  • 4R3  Ω

  • 2 R3  Ω

  • R Ω

For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure 

  • 4 Ω

  • 6 Ω

  • 2 Ω

  • 5 Ω

Which arrangement of four identical resistances should be used to draw maximum energy from a cell of voltage V 

An unknown resistance R1 is connected in series with a resistance of 10 Ω. This combinations is connected to one gap of a metre bridge while a resistance R2 is connected in the other gap. The balance point is at 50 cm. Now, when the 10 Ω resistance is removed the balance point shifts to 40 cm. The value of R1 is (in ohm) 

  • 60

  • 40

  • 20

  • 10

A wire has a resistance of 6 Ω. It is cut into two parts and both half values are connected in parallel. The new resistance is :

  • 12 Ω

  • 1.5 Ω

  • 3 Ω

  • 6 Ω

Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between

  • P and Q

  • Q and R

  • P and R

  • Any two points

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

      

  • 1 A

  • 2 A

  • 4 A

  • 6 A

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be 

  • 3

  • 1/3

  • 8/9

  • 2

2. 0.6 V

  • 0.4 V

  • 3. 1.2 V

  • In circuit shown below, the resistances are given in ohms and the battery is assumed ideal with emf equal to 3 volt. The voltage across the resistance R4 is 

  • 1.5 V

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