Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 60

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A group of $N$ cells whose emf varies directly with the internal resistance as per the equation $E_{N} = 1.5 r_{N}$ are connected, as shown in the figure. The current $I$ in the circuit is

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Important Questions on Current Electricity

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 61

The current in the resistance $R$ will be zero, if

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 62

The materials of negative electrode, positive electrode, electrolyte and depolariser of dry cell are respectively

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 63

A current of

4.8 A

is flowing in a conductor. The number of electrons passing through any cross-section per second is

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 64

The quantity of charge that flows through a given cross-section in one second, when there is a steady current of one ampere is

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 65

The net resistance of an ammeter should be small to ensure that

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 66

Two cylindrical rods of uniform cross-sectional area

A

and

2 A

having free electrons per unit volume

2 n

and

n

, respectively, are joined in series. A current

I

flows through them in steady-state. Then, the ratio of the drift velocity of a free electron in the left rod to the drift velocity of the electron in the right rod

(\frac{V_{L}}{V_{R}})

is,

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 67

Two electric bulbs, each designed to operate with a power of $500 W$ in $220 V$ lines are put in series in a $110 V$ . What will be the power generated by each bulb?

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 68

An electric heater is rated

1500 W

. Electric power costs

₹ 2

per

kW h

. Then, the cost of power for

10 h

running time is,