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Physics - Current Electricity

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81. Three resistances R1 = 4 Ω, R2 = 8 Ω and R3 = 2 Ω are connected in a circuit carrying a total current I, as shown in the figure. If the current through the resistance R1 = 4 Ω is 1.2 A, then the potential difference across the resistance R3 is

(NTSE Odisha, Stage-I, 2015-16)

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82. Two electric bulbs with ratings (100 W, 250 V) and (50 W, 250 V) are connected in series across a 250 V source. Calculate the output power (NTSE Odisha, Stage-I, 2016-17)

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83. The resistance of a wire of unit length and unit area of cross section is (NTSE Karnataka, Stage-I, 2015-16)

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84. Assertion (A) : In an household electrical circuit fuse is a safety device and is connected in series.
Reason (R) : Electrical fuse is prepared by the material having very high melting point. So it can allow very high voltage/current in the household electrical circuit.
Considering the above (NTSE Karnataka, Stage-I, 2016-17)

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85. The work done in carrying a charge of 2 micro coulomb from point A to point B is 6 x 10-4 J. The potential difference between these points will be (NTSE Madhya Pradesh, Stage-I, 2015-16)

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