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Physics - Current Electricity

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106. Three 6 Ω resistors are connected in parallel and the combination is connected to a 15 V battery. The current through anyone of the resistors will be

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107. If the five equal pieces of resistance wire having 5 Ω resistance each is connected in parallel, then their equivalent resistance will be (NTSE Gujarat, Stage-I, 2016-17)

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108. Ratio of resistivities of two materials A and B is 1 : 2, ratio of their length is 3 : 4. If the ratio of their radii is 2 : 3, find the ratio of resistance of A and B. (NTSE Chandigarh, Stage-I, 2016-17)

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109. Calculate the electricity bill for 30 days of a house in which a bulb 100 W operates for 6 hours/day, a fan rated 80 W operates for 10 hours/day and a refrigerator rated 400 W operates for 24 hours/day. Assume the cost of energy is ₹8.00 per kWh. (NTSE Chandigarh, Stage-I, 2015-16)

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110. Alloys are commonly used in electrical heating devices, like electric iron etc. because (NTSE Chandigarh, Stage-I, 2015-16)

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Current Electricity