EASY

12th CBSE

IMPORTANT

Earn 100

What torque acts on a $40$ turn coil of $100 {cm}^{2}$ area carrying a current of $10 A$ held with its axis at right angles to a uniform magnetic of $0.2 T$ ?

Important Questions on Magnetic Effect of Current

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Problems For Practice>Q 3

A square shaped plane coil of area

100 {cm}^{2}

200

turns carries a steady current of

5 A

. It is placed in a uniform magnetic field of

0.2 T

acting perpendicular to the plane of the coil. Calculate the torque on the coil when its plane makes an angle of

60 °

with the direction of the field. In which orientation will the coil be in stable equilibrium?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Problems For Practice>Q 5

A rectangular coil of

100

turns have length

5 cm

and width

4 cm

. It is placed with its plane parallel to a uniform magnetic field and a current of

2 A

is passed through the coil. If the torque acting on the coil is

0.2 N m

, find the magnitude of the magnetic field.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Problems For Practice>Q 6

A circular coil of radius

2.0 cm

has

500

turns and carries a current of

1.0 A

. Its axis makes an angle of

30 °

with the uniform magnetic field of

0.40 T

that exists in the space. Find the torque acting on the coil.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Problems For Practice>Q 7

A circular coil of

200

200 turns and radius

10 cm

is placed in a uniform magnetic field of

0.5 T

, normal to the plane of the coil. If the current in the coil is

3.0 A

, calculate the (a) total torque on the coil. (b) total force on the coil. (c) average force on each electron in the coil, due to the magnetic field. Assume the area of cross‐section of the wire to be

10^{- 5} m^{2}

and the free electron density is

10^{29} / m^{3}

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Problems For Practice>Q 1

A rectangular coil of area

100 {cm}^{2}

and consisting of

100

turns is suspended in a magnetic field of

5 \times 10^{- 2} T

. What current should be made to pass through it in order to keep equilibrium at an angle of

45 °

with the field? Given that torsion constant of the suspension fibre is

10^{- 8} N m \deg^{- 1}

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Problems For Practice>Q 2

The coil of a galvanometer consists of

250

turns of fine wire wound on a

2.0 cm \times 1.0 cm

rectangular frame. It is suspended in a uniform radial magnetic field of strength

2, 000 G

. A current of

10^{- 4} A

produces an angular deflection of

30 °

in the coil. Find the torsional constant of its suspension.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Problems For Practice>Q 3

A moving coil galvanometer is placed in a radial magnetic field of

0.2 T

. The galvanometer coil has

200

turns and area of

1 .6 \times 10^{- 4} m^{2}

. The torsion constant of the suspension fibre is

10^{- 6} N m \deg^{- 1}

. Determine the maximum current that can be measured by this galvanometer if its scale can accommodate a deflection of

45 °

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 4 - Magnetic Effect of Current>Problems For Practice>Q 4

The coil of moving coil galvanometer is

40 mm

long and

25 mm

wide. It has

100

turns and is suspended in a radial magnetic field of

10^{- 2} T

. It the suspension fibre has a torsional constant of

10^{- 8} N m \deg^{- 1}

. find the current sensitivity of the moving coil galvanometer.

What torque acts on a 40 turn coil of 100 cm2 area carrying a current of 10 A held with its axis at right angles to a uniform magnetic of 0.2 T?

Important Questions on Magnetic Effect of Current

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What torque acts on a $40$ turn coil of $100 {cm}^{2}$ area carrying a current of $10 A$ held with its axis at right angles to a uniform magnetic of $0.2 T$ ?