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Physics - Current Electricity

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6. Three equal resistors connected in series across a source dissipate 10 watts of power. What will be the power dissipated in watts if the same resistors are connected in parallel across the same source of e.m.f? (NTSE Delhi, Stage-I, 2012-13)

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7. Eight identical spherical mercury drops charged to a potential of 20 V each are coalesced into a single spherical drop (NTSE Delhi, Stage-I, 2012-13)

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8. A technician has 10 resistors each of resistance 0.1 Ω. The largest and smallest resistance that he can obtain by combining these resistors are (NTSE Delhi, Stage-I, 2012-13)

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9. An electric iron draws a current of 15 A from a 220 V supply. What is the cost of using iron for 30 min everyday for 15 days if the cost of unit is 2 rupees? (1 unit = 1 kWh) (NTSE Delhi, Stage-I, 2012-13)

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10. A charge of 1000 C flows through a conductor for 3 minutes and 20 seconds. Find the magnitude of current flowing through the conductor. (NTSE Andhra Pradesh, Stage-I, 2012-13)

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