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Two bars of radii r and 2r are kept in contact as shown. An electric current I is passed through the bars. Which one of following is correct?

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Important Questions on Current Electricity

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 65
Two bulbs 25 W, 220 V and 100 W, 220 V are given. Which one of them has a higher resistance?
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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 66
The thermocouple, among the following, that can produce maximum thermo-emf for the same temperature difference between the junction, is
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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 67
Two electric bulbs, each designed to operate with a power of 500 W in a 220 V line are connected in series to a 110 V line. The power generated by each bulb will be:
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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 68
In the circuit shown, the heat produced in the 5 Ω resistor due to current flowing in it is 10 cal s-1. The heat generated in the 4 Ω resistor is:

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 69
Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100 W, 60 W and 40 W bulbs have filament resistances R100 ,R60 and R40, respectively, the relation between these resistances is
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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 70
An electric bulb is rated 220 V-100 W. The power consumed by it when operated on 110 V will be
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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 71
A current of 2 A, passing through a conductor produces 80 J of heat in 10 seconds. The resistance of the conductor in ohm is
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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 72
Two resistances, a 60 Ω and an unknown one are connected to a power source in a series arrangement. Power of the unknown resistance is 60 W. What is the voltage of the power source at the least ?