A current-carrying conductor has 8 . 0 × 10 22 free electrons per metre length and their mean drift velocity is 8 . 0 × 10 - 5 ms - 1 If a magnetic field of 0 . 10 T be applied perpendicular to the conductor, then calculate (i) current in the conductor,

Current = Total charge time = n · v × e I = 8 × 10 22 × 8 × 10 - 5 × 1 . 6 × 10 - 19 = 6 . 4 × 1 . 6 × 10 - 2 = 102 . 4 Current = 1 . 024 A .

EASY

12th ICSE

IMPORTANT

Earn 100

The velocity of an electron at a point A is $10^{7} {ms}^{- 1}$ Find the time taken by the electron in going from A to B.

Important Questions on Moving Charges and Magnetic Field

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 7 - Moving Charges and Magnetic Field>QUESTIONS>Q 33

A proton, a deuteron and an

α

-particle, whose kinetic energies are same, enter perpendicularly a magnetic field. Compare the radii of their circular paths.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 7 - Moving Charges and Magnetic Field>QUESTIONS>Q 34

What should be the minimum magnitude and direction of the magnetic field that must be produced at the equator of earth so that a proton may go round the earth with a speed of

1.0 x 10^{7} {ms}^{- 1}

? Earth’s radius is

6.4 x 10^{6} m .

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 7 - Moving Charges and Magnetic Field>QUESTIONS>Q 35

3.0 cm

long wire carrying a current of

10 A

is placed perpendicular to a magnetic field of

0.27 T .

Find the force experienced by the wire.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 7 - Moving Charges and Magnetic Field>QUESTIONS>Q 36

Find the force per unit length on a wire carrying a current of

8 A

and making

30 °

angle with the direction of a uniform magnetic field of

0.15 T .

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 7 - Moving Charges and Magnetic Field>QUESTIONS>Q 37

A current of

5.0 A

is flowing upwards in a long vertical wire placed in a uniform horizontal northward magnetic field of

0.020 T

. How much force and in what direction will the field exert on

0.06 m

length of the wire?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 7 - Moving Charges and Magnetic Field>QUESTIONS>Q 38

Two parallel rails, distant

2.0 x 10^{- 2} m,

are laid in north-south direction. On these rails is kept a metal cylinder of mass

4.0 x 10^{- 2} kg . A

battery is connected to the rails with its positive terminal joined to the rail on the eastern side. The battery sends a current of

3.0 A

in the cylinder. If a uniform magnetic field of

1.2 T

directed upwards be there, then find out the magnitude and direction of the magnetic force imposed upon the cylinder. What would be the acceleration in the cylinder?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 7 - Moving Charges and Magnetic Field>QUESTIONS>Q 39

On a

30 °

inclined smooth plane, a thin current-carrying rod is placed parallel to the horizontal ground. The plane is located in a uniform vertical magnetic field of

0.15 T .

The mass/length of the rod is

0.30 kg m^{- 1} .

Find the current required to keep the rod stationary .

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 7 - Moving Charges and Magnetic Field>QUESTIONS>Q 40

A current-carrying conductor has $8.0 \times 10^{22}$ free electrons per metre length and their mean drift velocity is $8.0 \times 10^{- 5} {ms}^{- 1}$ If a magnetic field of $0.10 T$ be applied perpendicular to the conductor, then calculate

(i) current in the conductor,

The velocity of an electron at a point A is 107 ms-1 Find the time taken by the electron in going from A to B.

Important Questions on Moving Charges and Magnetic Field

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The velocity of an electron at a point A is $10^{7} {ms}^{- 1}$ Find the time taken by the electron in going from A to B.