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In the meter bridge shown below, the resistance X has a negative temperature coefficient of resistance. Neglecting the variation in other resistors, when current is passed for some time in the circuit, balance point should shift towards

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Important Questions on Current Electricity

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 45
A galvanometer of resistance 100Ω gives full scale deflection at 10 mA current. What should be the value of shunt so that it can measure a current of 100 mA?
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 46
Two cells of emf E1 and E2 are joined in series and the balancing length of the potentiometer wire is 625 cm. If the terminals of E1 are reversed, the balancing length obtained is 125 cm. Given E2>E1, the ratio E1: E2 will be
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 47
A 10 m long potentiometer wire is connected to a battery having a steady voltage. A Leclanche cell is balanced at 4 m of the wire. If the length is kept the same but its cross-section is doubled, the null point will be obtained at
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 48
Out of the two bulbs in a household circuit, one bulb glows brighter than the other, Which of the two bulbs has a large resistance?
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 49
Two electric bulbs whose resistance are in the ratio 1:2 are connected in parallel to a constant voltage source. The power dissipated in them will have the ratio
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 50
How many 60 W bulbs may be safely run on 220 V using a 5 A fuse?
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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 51

Three identical bulbs B1, B2 and B3 are connected to the mains as shown in figure. If B3 is disconnected from the circuit by opening switch S, then incandescence of bulb B1 will

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 52
A 50 W bulb connected in series with a heater coil is put to an AC mains. Now the bulb is replaced by a 100 W bulb. The heater output will