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 %

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IMPORTANT

Earn 100

A thin ring of radius $R$ meter has charge $q$ coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of $f$ revolutions per second. The value of magnetic induction in $Wb m^{- 2}$ at the centre of the ring is

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Important Questions on Moving Charges and Magnetism

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 73

An electron moves in a circular orbit with a uniform speed

v

. It produces a magnetic field

B

at the Centre of the circle. The radius of the circle is proportional to

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CUET (UG)

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 74

The magnitude of the magnetic field at the centre of a tightly wound

150

turns coil of radius

12 cm

carrying a current of

2 A

is: (

1 G = 10^{- 4} T

μ_{0} = 4 π \times 10^{- 7} T m A^{- 1}

)

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 75

Two circular coils

X

and

Y

having the equal number of turns and carry equal currents in the same sense and subtend same solid angle at point

O .

If the smaller coil

X

is midway between

O

and

Y,

then if we represent the magnetic induction due to bigger coil

Y

O

B_{Y}

and due to smaller coil

X

O

B_{X}

then

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 76

A circular current-carrying coil has a radius

R

. The distance from the centre of the coil on the axis of the coil, where the magnetic induction is

\frac{1}{8}

th of its value at the centre of the coil is

HARD

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 77

A thin insulated wire forms a plane spiral of

N = 100

tight turns carrying a current

I = 8 mA

(milliampere). The radii of inside and outside turns are

a = 50

mm

and

b = 100

mm

respectively. The magnetic induction at the centre of the spiral is

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 78

A current

I

flowing through the loop as shown in the adjoining figure. The magnetic field at centre O is

Question Image

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 79

A long straight wire of radius

a

carries a steady current

I

. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields

B

and

B^{'}

at radial distances

\frac{a}{2}

and

2 a

respectively, from the axis of the wire is

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CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 80

Ampere's law is analogous to

A thin ring of radius R meter has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolutions per second. The value of magnetic induction in Wb m-2 at the centre of the ring is

Important Questions on Moving Charges and Magnetism

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A thin ring of radius $R$ meter has charge $q$ coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of $f$ revolutions per second. The value of magnetic induction in $Wb m^{- 2}$ at the centre of the ring is