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Two insulated circular loop $A$ and $B$ radius $a$ carrying a current of $I$ in the anti clockwise direction as shown in figure. The magnitude of the magnetic induction at the centre will be :

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Important Questions on Moving Charges and Magnetism

EASY

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A current

i

flows through a loop as shown in figure. The magnetic field at the Centre

O

HARD

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A small circular loop of conducting wire has radius a and carries current

I .

It is placed in a uniform magnetic field

B

perpendicular to its plane such that when rotated slightly about its diameter and released, it starts performing simple harmonic motion of time period

T .

The mass of the loop is

m

then:

EASY

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

The magnetic field at the centre of a circular coil of

50

turns and radius

10 cm

carrying a current of

1 A,

in tesla is

MEDIUM

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

Let

{\vec{B}}_{1}

is the magnetic field at the centre of the current carrying coil of radius

R

and

{\vec{B}}_{2}

is the magnetic field on the axis of same circular coil at the distance of

3 R .

Then the ratio

\frac{|{\vec{B}}_{1}|}{|{\vec{B}}_{2}|}

MEDIUM

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

Two infinitely long wires each carrying current

I

along the same direction are made into the geometry as shown in the figure below.
Question Image

The magnetic field at the point

P

MEDIUM

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

The coefficient of self-induction of a closely wound coil of

100

turns and area of cross-section

1 {cm}^{2}

1 mH

. Find the magnetic induction at the centre of its core when a current of

2 A

flows in it.

EASY

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

The magnetic field at the centre ${}^{'}O^{'}$ in the given figure is

Question Image

HARD

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A circular coil connected to a battery of emf

E

produced a certain magnetic induction field at its centre. The coil is unwound, stretched to double its length rewound into a coil of

\frac{1^{rd}}{3}

of the original radius and connected to a battery of emf

E^{'}

to produce same field at the centre. Then

E^{'}

EASY

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

Fill in the blank with the most appropriate option given below.

We should give everyone training in citizenship, but we have______this aspect till now.

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Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

The magnitude of a magnetic field at the centre of a circular coil of radius

R

, having

N

turns and carrying a current

I

can be doubled by changing

MEDIUM

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

Two circular loops

L_{1}

and

L_{2}

of wire carrying equal and opposite currents are placed parallel to each other with a common axis. The radius of loop

L_{1}

R_{1}

and that of

L_{2}

R_{2}

. The distance between the centres of the loops is

\sqrt{3} R_{1}

. The magnetic field at the centre of

L_{2}

shall be zero if

EASY

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A Helmholtz coil has a pair of loops, each with

N

turns and radius

R

. They are placed coaxially at distance

R

and the same current

I

flows through the loops in the same direction. The magnitude of the magnetic field at

P,

midway between the centres

A

and

C,

is given by [Refer to figure given below]:
Question Image

EASY

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A circular coil of radius

R

carries an electric current

I

. The magnetic field due to the coil at a point on the axis of the coil located at a distance

r

from the centre of the coil, such that

r ≫ R,

the magnetic field at that point is proportional to

MEDIUM

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

The magnetic field at the centre $O$ of the current-carrying square loop shown in the figure is

Question Image

EASY

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

Magnetic field at the centre of a circular loop of area

A

B

. The magnetic moment of the loop will be (

μ_{0} =

permeability of free space)

HARD

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A light charged particle is revolving in a circle of radius

r

in electrostatic attraction of a static heavy particle with opposite charge. How does the magnetic field

B

at the centre of the circle due to the moving charge depend on

r

MEDIUM

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A circular loop of radius

r

of conducting wire connected with a voltage source of zero internal resistance produces a magnetic field

B

at its centre. If instead, a circular loop of radius

2 r

, made of same material, having the same cross-section is connected to the same voltage source, what will be the magnetic field at its centre?

MEDIUM

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A thin ring of

10 c m

radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of

40 π r a d s^{- 1}

about its axis, perpendicular to its plane. Is the magnetic field its centre is

3.8 \times 10^{- 9} T

, then the charge carried by the ring is close to

(μ_{0} = 4 π \times 10^{- 7} N A^{- 2}) .

EASY

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

An electron moving in a circular orbit of radius

r

makes

n

rotations per second. The magnetic field produced at the center has magnitude:

MEDIUM

Physics>Electricity and Magnetism>Moving Charges and Magnetism>Magnetic Field on the Axis of a Circular Current Loop

A circular coil carrying current

I

has a radius

R

and magnetic field at the centre is

B

. The distance from the centre along the axis of the same coil where the magnetic field will be

\frac{B}{8}

Two insulated circular loop A and B radius a carrying a current of I in the anti clockwise direction as shown in figure. The magnitude of the magnetic induction at the centre will be :

Important Questions on Moving Charges and Magnetism

Learn and Prepare for any exam you want !

Two insulated circular loop $A$ and $B$ radius $a$ carrying a current of $I$ in the anti clockwise direction as shown in figure. The magnitude of the magnetic induction at the centre will be :