Q. No.Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will fit snugly within conductor A, and conductor C will fit snugly within conductor B. Relationship between their end to end resistance is
(1) RA = RB = RC
(2) RA > RB > RC
(3) RA < RB < R
(4) Information is not sufficient
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A ring is made of a wire having a resistane
. Find the points A and B, as shown
in the figure, at which a current carrying
conductor should be connected so that the
resistance R of the sub circuit between these
points is equal to 8/3
1. 2.
3. 4.
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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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