Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 77

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The reciprocal of resistance 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 78

The figure below shows currents in a part of electric circuit. The current $i$ is

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 79

The magnitude and direction of the current in the circuit shown will be

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 80

The current in the $4 Ω$ resistance is (battery is ideal)

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 81

In the figure shown, the current flowing through $2 R$ is

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 82

A cell of internal resistance

1.5 Ω

and of

emf 1.5 V

balances

500 cm

on a potentiometer wire. If a wire of

15 Ω

is connected between the balance point and the cell, then the balance length will be

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 83

A potentiometer is used for the comparison of emf of two cells

E_{1}

and

E_{2}

. For cell

E_{1}

, the no deflection point is obtained at

20 cm

and for

E_{2},

the no deflection point is obtained at

30 cm

. The ratio of their emf's will be

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 84

$A B$ is a wire of uniform resistance. The galvanometer $G$ shows no current, when the length $A C = 20 cm$ and $C B = 80 cm$ . The resistance $R$ is equal to

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 2>Q 85

A potentiometer having the potential gradient of

2 mV {cm}^{- 1}

is used to measure the difference of potential across a resistance of

10 Ω

in some circuit. If a length of

50 cm

of the potentiometer wire is required to get the null point, the current passing through the

10 Ω

resistor is (in

mA

)