Q. No.A battery of internal resistance 4Ω is connected to the network of resistances as shown. In order to give the maximum power to the network, the value of R (in Ω) should be :
(1) 4/9
(2) 8/9
(3) 2
(4) 18
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When the key K is pressed at time t = 0, which of the following statement about the current I in the resistor AB of the given circuit is true?
| 1. | I = 2 mA at all t |
| 2. | I oscillates between 1 mA and 2 mA |
| 3. | I = 1 mA at all t |
| 4. | At t = 0 , I = 2 mA and with time, it goes to 1 mA |
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In the circuit shown below, the cell has an e.m.f. of 10 V and internal resistance of 1 ohm. The other resistances are shown in the figure. The potential difference is :
(1) 6 V
(2) 4 V
(3) 2 V
(4) –2 V
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E denotes electric field in a uniform conductor, I corresponding current through it, Vd drifts velocity of electrons and P denotes thermal power produced in the conductor, then which of the following graph is incorrect :
(1)
(2)
(3)
(4)
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In given figure, the potentiometer wire AB has a resistance of 5 Ω and length 10 m. The balancing length AM for the emf of 0.4 V is :
(1) 0.4 m
(2) 4 m
(3) 0.8 m
(4) 8 m
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As the switch S is closed in the circuit shown in the figure, the current passed through it is:
(1) 4.5 A
(2) 6.0 A
(3) 3.0 A
(4) Zero
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1. \(0.25~\text{A}\)
2. \(0.8~\text{A}\)
3. \(0.2~\text{A}\)
4. \(0.5~\text{A}\)
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In the circuit element given here, if the potential at point B, VB = 0, then the potentials of A and D are given as
(1)
(2)
(3)
(4)
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A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/ quantities constant along the length of the conductor is/are :
(1) Current, electric field and drift speed
(2) Drift speed only
(3) Current and drift speed
(4) Current only
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The internal resistances of the two cells shown are 0.1 Ω and 0.3 Ω. If R = 0.2 Ω, the potential difference across the cell :
(1) B will be zero
(2) A will be zero
(3) A and B will be 2V
(4) A will be > 2V and B will be < 2V
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