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

Earn 100

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 -

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Important Questions on Moving Charges and Magnetism

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CUET (UG)

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

CUET (UG)

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 ?

EASY

CUET (UG)

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

Question Image

EASY

CUET (UG)

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

EASY

CUET (UG)

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

CUET (UG)

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 -

EASY

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 121

Two thin long parallel wires separated by a distance $d$ carry a current of

i A

in the same direction. Let the length of each wire be

L

. They will

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 3r and current in each wire is reduced to I/3, the force between them will now be -

Important Questions on Moving Charges and Magnetism

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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 -