Question Pool Moving Charges and Magnetism

# Moving Charges and Magnetism - SAMAGRA Question Pool & Answers | Class 12

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Physics Moving Charges and Magnetism

Qn 1.

A long solenoid of length 3m has 4000 turns. Find the current through the solenoid if the magnetic field produced at the centre of the solenoid along its axis is 8 × 10-3T.

• Answer)

4.77A

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Qn 2.

Of the following devices, which has small resistance?

(a) moving coil galvanometer

(b) ammeter of range 0 – 1A

(c) ammeter of range 0–10 A

(d) voltmeter

• Answer)

(c) ammeter of range 0–10 A

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Qn 3.

What do you mean by electromagnetic Lorentz force  ?

• Answer)

The force acting on a charge moving under the effect of both electric and magnetic field is called electromagnetic Lorentz force

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Qn 4.

Who discovered the phenomenon  of magnetic field due to the presence of current in a conductor ?

• Answer)

Oersted

(Hans Christian

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Qn 5.

Draw the path of a charged particle in a cyclotron ?

• Answer)

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Qn 6.

A 100 turns closely wound circular coil of radius 10 cm carries a current of 3.2 A . A coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 2 T rotates the coil through 90o . What is the torque on the coil ?

• Answer)

m = NAI = N I π r2

= 100 x 3.2 x 3.14 x ( 0.1 )2

m = 10 A m2 and B = 2

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Qn 7.

A 100 turns closely wound circular coil of radius 10 cm carries a current of 3.2 A .What is the magnetic moment adssociated with it ?

• Answer)

N = 100 , I = 3.2 A  , r = 0.1 m

m = NAI = N I π r2

= 100 x 3.2 x 3.14 x ( 0.1

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Qn 8.

A 100 turns closely wound circular coil of radius 10 cm carries a current of 3.2 A . What is the field at the centre of the coil ?

• Answer)

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Qn 9.

The horizontal component of the earth ‘s magnetic field at a certain place is 3.0 x 10-5 T and the directionof the field is from south to north. A very long straight conductoris carrying a steady current of 1 A placed on a horizontal table ,what is the force per unit length of the conductor ?

• Answer)

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Qn 10.

How can we increase the current sensitivty of a moving coil galvanometer ?

• Answer)

Current sensitivty of a moving coil galvanometer can be increased by increasing the number of turns ( N ) , area of the coil ( A ) , magnetic field ( B  ) and

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Qn 11.

What do you mean by current sensitivity ?

• Answer)

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Qn 12.

Explains the construction and the working of moving coil galvanometer ?

• Answer)

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Qn 13.

What is the speciality of a moving coil galvanometer ?

• Answer)

In a moving coil galvanometer ,the magnet is fixed and the coil is

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Qn 14.

What is the principle of a moving coil galvanometer ?

• Answer)

A moving coil galvanometer works on the principle of torque experienced on a rectangular current loop placed in a uniform magnetic

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Qn 15.

Write the value of Bohr magneton ?

• Answer)

( μl ) = 9.27 x 10-24 Am2

This value is called the Bohr

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Qn 16.

write the equation for  Bohr magneton

• Answer)

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Qn 17.

wirite the value of gyromagnetic ratio?

• Answer)

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Qn 18.

What is gyromagnetic ratio ?

• Answer)

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Qn 19.

Explains the angular momentum of electron ?

• Answer)

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Qn 20.

Compares the torque on an electric dipole in a uniformfield and magnetic dipole in a uniform magnetic field ?

• Answer)

Torque on an electric dipole in uniform electric field

τ = p x E

τ = pEsinθ

Where θ is the angle between the

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Qn 21.

What happens to a rectangular current loop  placed in a uniform magnetic field ?

• Answer)

When a rectangular current loop is placed in uniform magnetic field , it experiences a torque and the loop get rotates in the magnetic

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Qn 22.

Define one Ampere ?

• Answer)

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Qn 23.

Write the expression for magnetic force in a current carrying conductor ?

• Answer)

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Qn 24.

A solenoid of length 0.5 m has a radius of 1 cmand is made up of 500 turns .It carrying a current of 5 A , what is the magnetic field inside the solenoid ?

• Answer)

B = μο n i

n = N / l = 500 / 0.5 = 1000

B = 4π x10-7 x 1000 x 5

B = 6.28 x 10-3

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Qn 25.

write the eqation of the intensity of magnetic field at the center of a current carrying toroid?

• Answer)

A current carrying toroid produce magnetic field at its centre,

B = μο n

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Qn 26.

What is a toroid ?

• Answer)

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Qn 27.

What is the value of  magnetic field out side a current carrying solenoid ?

• Answer)

B = 0

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Qn 28.

What is the magnetic field at one end along the axis of a current carrying solenoid ?

• Answer)

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Qn 29.

What is the magnetic field at the centre along the axis of a current carrying solenoid ?

• Answer)

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Qn 30.

What is the equation of magnetic moment of a current carrying solenoid ?

• Answer)

Magnetic moment , m = ANI

A – area of crossection of the solenoid

N – total number of turns in the solenoid

I –

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Qn 31.

Write the expression for magnetic field at a point due to an infinite straight conductor carrying current ?

• Answer)

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Qn 32.

State Amperes’ circuital law ?

• Answer)

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Qn 33.

Write the expression for the magnetic field at the centre of a current loop ?

• Answer)

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Qn 34.

State and explain Biot-Savart law ?

• Answer)

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Qn 35.

What is the SI unit of magnetic field ?

• Answer)

Tesla ( T )

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Qn 36.

A cyclotron oscillator frequency is 10 MHz is applied to the dees of radius 60 cm. What is the kinetic energy in MeV of the proton beam produced by the accelerator , if the operating magnetic field is 0.66 T ?(e = 1.60 x10-19 C ,mp = 1.67 x 10-27 kg )

• Answer)

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Qn 36.

A cyclotron oscillator frequency is 10 MHz is applied to the dees of radius 60 cm. What is the kinetic energy in MeV of the proton beam produced by the accelerator , if the operating magnetic field is 0.66 T ?(e = 1.60 x10-19 C ,mp = 1.67 x 10-27 kg )

• Answer)

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Qn 37.

A cyclotron oscillator frequency is 10 MHz. What should be the operating magnetic field for accelerating protons ? ( e = 1.60 x 10-19 C ,mp = 1.67 x 10-27 kg )

• Answer)

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Qn 38.

Write the expression for speed of a charged particle in a cylotron ?

• Answer)

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Qn 39.

Write the expression for energy acquired by a charged particle in a cyclotron and mention the terms ?

• Answer)

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Qn 40.

What is a cyclotron ?

• Answer)

Cyclotron is a device used to accelerate charged particles , hence it is also called particle accelerator. It is based on the principle of motion of a charged

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Qn 41.

What is cyclotron frequency ?

• Answer)

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Qn 42.

Mention the principle of Cyclotron ?

• Answer)

Motion of a charged particle in uniform perpendicular magnetic

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Qn 43.

What is velocity selector ?

• Answer)

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Qn 44.

What is the frequency of electron moving with a speed of 3 x 107 ms-1 in a magnetic field of 6 x 10-4 T perpendicular to it traces a radius 26 cm? [ Given mass of electro 9.1 x 10-31 kg and charge of electro 1.6 x 10-19 ]

• Answer)

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Qn 45.

What is the radius of the path of an electron moving with a speed of 3 x 107 ms-1 in a magnetic field of 6 x 10-4 T perpendicular to it ? [ Given mass of electro 9.1 x 10-31 kg and charge of electro 1.6 x 10-19 ]

• Answer)

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Qn 46.

How will you convert a galvanometer into voltmeter ? Explain

• Answer)

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Qn 47.

How will you convert a galvanometer into an ammeter ? Explain

• Answer)

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Qn 48.

Cyclotron is a device used for accelerating charged particles

( a ) Draw a neat labelled diagram of a cyclotron and write the Principle behind it , mention each term

( b ) A cyclotron’s oscillator frequency is 10 MHz. What should be the operating magnetic field for accelerating protons ?

• Answer)

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Qn 49.

Calculate the maximum kinetic energy of the proton ejected from the cyclotron with dee of radius 2 m .The dees are applied with a uniform magnetic field of 0.8 T ?

• Answer)

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