# SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 chapter 10 - Magnetic Effect of Electric Current [Latest edition]

## Chapter 10: Magnetic Effect of Electric Current

MCQ’S

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 10 Magnetic Effect of Electric Current MCQ’S

#### 1 Mark Each

MCQ’S | Q 1

According to the right-hand rule, the direction of magnetic induction if the current is directed in an anticlockwise direction is ______

• perpendicular and inwards

• perpendicular and outwards

• same as current

• opposite to that of current

MCQ’S | Q 2

A conductor has three segments; two straights of length L and a semicircular with radius R. It carries a current I What is the magnetic field B at point P?

• (mu_0 I)/(4piR)

• mu_0/(4pi)I/R^2

• (mu_0I)/(4R)

• (mu_0I)/(4pi)

MCQ’S | Q 3

A strong magnetic field is applied to a stationary electron. Then the electron ______

• moves in the direction of the field

• remained stationary

• moves perpendicular to the direction of the field

• moves opposite to the direction of the field

MCQ’S | Q 4

The force between two parallel current-carrying conductors is F. If the current in each conductor is doubled, then the force between them becomes ______

• 4F

• 2F

• F

• F/4

MCQ’S | Q 5

Which of the following is not a unit of magnetic induction?

• guass

• tesla

• oersted

• Wb/m

MCQ’S | Q 6

The magnetic dipole moment of the current loop is independent of ______

• number of turns

• area of loop

• current in the loop

• the magnetic field in which it is lying

MCQ’S | Q 7

A circular loop of radius 0.0157 m carries a current 2 A. The magnetic field at the centre of the loop is ______

• 1.57 × 10-3 Wb/m²

• 8.0 × 10-5 Wb/m²

• 2.0 × 10-3 Wb/m2

• 3.14 × 10-1 Wb/m²

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 10 Magnetic Effect of Electric Current Very Short Answer

#### 1 Mark Each

Very Short Answer | Q 1

What is Lorentz force?

Very Short Answer | Q 2

What is Solenoid?

Very Short Answer | Q 3

What is Toroid?

Very Short Answer | Q 4

Calculate the value of the magnetic field at a distance of 2 cm from a very long straight wire carrying a current 5 A?

Very Short Answer | Q 5

What happens to the magnetic field at the centre of a circular current-carrying coil if we double the radius of the coil keeping the current unchanged?

Very Short Answer | Q 6

A solenoid of length 50 cm of the inner radius of 1 cm and is made up of 500 turns of copper wire for a current of 5 A in it. What will be the magnitude of the magnetic field inside the solenoid?

Very Short Answer | Q 7

State the orientation of magnetic dipole with respect to a magnetic field, which possesses maximum magnetic potential energy.

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 10 Magnetic Effect of Electric Current Short Answer I

#### 2 Marks Each

Short Answer I | Q 1

A toroid of 4000 turns has an outer radius of 26 cm and an inner radius of 25 cm. If the current in the wire is 10 A. Calculate the magnetic field of the toroid.

Short Answer I | Q 2

Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid Why?

Short Answer I | Q 3

A solenoid of length π m and 5 cm in diameter has a winding of 1000 turns and carries a current of 5 A. Calculate the magnetic field at its centre along the radius.

Short Answer I | Q 4

Currents of equal magnitude pass through two long parallel wires having a separation of 1.35 cm. If the force per unit length on each of the wires is 4.76 x 10-2 N/m, what is I?

Short Answer I | Q 5

Explain "Magnetic force never does any work on moving charges".

Short Answer I | Q 6

State the conditions when the magnetic potential energy of a magnetic dipole (current-carrying coil) kept in the uniform magnetic field be minimum and maximum.

Short Answer I | Q 7

Derive the expression for magnetic field produced by a current in a circular arc of wire.

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 10 Magnetic Effect of Electric Current Short Answer II

#### 3 Marks Each

Short Answer II | Q 1

Explain the construction and working of the Moving coil Galvanometer.

Short Answer II | Q 2

Explain Biot Savart's Law.

Short Answer II | Q 3

A Rectangular coil of 10 turns, each of area 0.05 m2, is suspended freely in a uniform magnetic field of induction 0.01 T. A current of 30 µA is passed through it.

(i) What is the magnetic moment of the coil?

(ii) What is the maximum torque experienced by the coil?

Short Answer II | Q 4

Using Ampere's Law, derive an expression for the magnetic induction inside an ideal solenoid carrying a steady current.

Short Answer II | Q 5

Derive an expression for the net torque on a rectangular current carrying loop placed in a uniform magnetic field with its rotational axis perpendicular to the field.

Short Answer II | Q 6

A circular loop of radius 9.7 cm carries a current 2.3 A. Obtain the magnitude of the magnetic field
(a) at the centre of the loop
(b) at a distance of 9.7 cm from the centre of the loop but on the axis.

Short Answer II | Q 7

The magnetic field at the centre of a circular loop of radius 12.3 cm is 6.4 x 10-6 T. What will be the magnetic moment of the loop?

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 10 Magnetic Effect of Electric Current Long Answer

#### 4 Marks Each

Show that currents in two long, straight, parallel wires exert forces on each other. Derive the expression for the force per unit length on each conductor.

Using Biot Savarts law, obtain the expression for the magnetic induction near a straight infinitely long current-carrying wire.

Derive an expression for axial magnetic field produced by current in a circular loop.

## SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 chapter 10 - Magnetic Effect of Electric Current

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Concepts covered in 12th Standard HSC Physics Maharashtra State Board 2021 chapter 10 Magnetic Effect of Electric Current are Magnetic Fields Due to Electric Current, Magnetic Force, Cyclotron Motion, Helical Motion, Magnetic Force on a Wire Carrying a Current, Force on a Closed Circuit in a Magnetic Field, Torque on a Current Loop in Magnetic Field, Magnetic Dipole Moment, Magnetic Potential Energy of a Dipole, Magnetic Field Due to a Current: Biot-savart Law, Force of Attraction Between Two Long Parallel Wires, Magnetic Field Produced by a Current in a Circular Arc of a Wire, Axial Magnetic Field Produced by Current in a Circular Loop, Magnetic Lines for a Current Loop, Ampere's Law, Magnetic Field of a Solenoid and a Toroid.

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