The number of turns in a coil of Galvanometer is tripled, then

Voltage sensitivity remains constant and current sensitivity increases 3 times

Both voltage and current sensitivity remains constant

Voltage sensitivity increases 3 times and current sensitivity remains constant

Both voltage and current sensitivity decreases by 33 %

EASY

CUET (UG)

IMPORTANT

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Consider two long, straight and parallel conducting wires carrying currents flowing in opposite directions in them. Then, the force per unit length between them is always

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Important Questions on Moving Charges and Magnetism

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 113

Two long parallel wires separated by a distance

r

have equal currents

I

flowing in each. Either wire experiences a magnetic force

F N / m^{}

. If the distance $r$ is increased to

3 r

and current in each wire is reduced to

I / 3

, the force between them will now be -

EASY

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 114

When two infinitely long parallel wires separated by a distance of 1m, each carry a current of 3 ampere, the force in newton/ metre length experienced by each will be, (given

μ_{0} = 4 π \times 10^{- 7}

S.I. Units).

HARD

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 115

Two long straight parallel conductors are separated by a distance of

5 cm

and carrying current

20 A

. What work per unit length of conductor must be done to increase the separation between conductors to

10 cm

, if the current flows in the same direction ?

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 116

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current $I$ along the same direction is shown in Figure. Magnitude of force per unit length on the middle wire $B$ is given by

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 117

Two thin long parallel wires separated by a distance

b

are carrying currents of

i

amp each, the magnitude of the force per unit length exerted by one wire over the other is

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 118

Two long conductors, separated by a distance

d

carry currents

I_{1}

and

I_{2}

in the same direction. They exert a force

F

on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 3

d

. The new value of the force between them is

MEDIUM

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 119

Two wires of main supply are at a distance

12 cm

. If the force per unit length between them is equal to

4 m g

weight where

m = 10^{- 6} kg / m

, the current in both wires would be (Consider both wires have equal current)

EASY

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 120

Two long parallel wires separated by a distance

r

have equal currents

I

flowing in each. Either wire experiences a magnetic force

F N / m^{}

. If the distance $r$ is increased to

3 r

and current in each wire is reduced to

I / 3

, the force between them will now be -

Consider two long, straight and parallel conducting wires carrying currents flowing in opposite directions in them. Then, the force per unit length between them is always

Important Questions on Moving Charges and Magnetism

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