Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 27

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Two batteries, one of emf 18 volts and internal resistance $2 Ω$ and the other of emf 12 volst and internal resistance $1 Ω$ , are connected as shown. The voltmeter V will record a reading of :-

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Important Questions on Current Electricity

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 28

Electric resistance is defined as the ratio of voltage to current. Its dimensional formulae is given by

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 29

In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure.
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S. No.	$R (Ω)$	$l (c m)$
_1. _2. _3. _4.	$1000$ $100$ $10$ $1$	$60$ $13$ $1.5$ $1.0$

Which of the reading is inconsistent?

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 30

In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance

P = 4 Ω

and the neutral point

N

is at

60 cm

from

A

. Now an unknown resistance

R

is connected in series to

P

and the new position of the neutral point is at

80 cm

from

A

. The value of unknown resistance

R

is -

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 31

In a meter bridge as shown in the figure, it is given that resistance

Y = 12.5 Ω

and that the balance is obtained at a distance

39.5 cm

from end

A

(by jockey

J

). After interchanging the resistances

X

and

Y

a new balance point is found at a distance

l_{2}

from end

A

. What are the values of

X

(in

Ω

) and

l_{2}

?

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 32

A

200 Ω

resistor has certain colour code. If one replaced the red colour by green in the code, the new resistance will be:

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 33

A uniform metallic wire has a resistance of

18 Ω

and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is:

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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 34

In the figure, a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is:
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Physics Crash Course NEET>Chapter 13 - Current Electricity>Level 3>Q 35

The equivalent resistance between points $A$ and $B$ is

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