A current passes through a wire of variable cross-section in steady-state as shown. Then incorrect statement is:
1. | Current density increases in the direction of the current. |
2. | Potential increases in the direction of the current. |
3. | Electric field increases in the direction of the current. |
4. | Drift speed increases in the direction of the current. |
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The value of E (emf of the cell) in the circuit given below is:
1. | 24 V | 2. | 32 V |
3. | 16 V | 4. | 8 V |
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Two cells of e.m.f. E and internal resistance r1 and r2 are connected in series through an external resistance R. The value of R for which the potential difference across one of the cells becomes zero will be:
1.
2.
3.
4.
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In the given circuit diagram, 3 identical bulbs are connected. If bulb B3 get fused suddenly, how will the brightness of bulbs B1 and B2 change?
1. | Brightness of bulb B1 will increase whereas brightness of bulb B2 will decrease |
2. | Brightness of bulb B2 will increase whereas brightness of bulb B1 will decrease |
3. | Brightness of both bulbs B1 and B2 will increase |
4. | Brightness of bulb B1 will increase whereas brightness of bulb B2 will remain the same |
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What is the reading of the voltmeter of resistance 1200 connected in the following circuit diagram?
1. 2.5 V
2. 5.0 V
3. 7.5 V
4. 40 V
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The dependence of resistivity \((\rho)\) on the temperature \((T)\) of a semiconductor is, roughly, represented by:
1. | 2. | ||
3. | 4. |
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Current through the \(2~\Omega\) resistance in the electrical network shown is:
1. | zero | 2. | \(1\) A |
3. | \(3\) A | 4. | \(5\) A |
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Two batteries, one of emf 18V and internal resistance 2 and the other of emf 12 V and internal resistance 1 are connected as shown. Reading of the voltmeter is:
(if voltmeter is ideal)
1. 14 V
2. 15 V
3. 18 V
4. 30 V
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A current of 2 A is to be sent through a resistor of \(5 ~\Omega.\) Number of cells required in series, if each has emf 2 V and internal resistance 0.5 , are:
1. 40
2. 30
3. 20
4. 10
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A 50 kW dc generator produces a potential difference of 250 V. If the resistance of the transmission line is 1 , what percentage of the original power is lost during transmission?
1. 80%
2. 40%
3. 20%
4. 10%
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