#### Chapters

Chapter 2: Mechanical Properties of fluids

Chapter 3: Kinetic Theory of gases and Radiation

Chapter 4: Thermodynamics

Chapter 5: Oscillations

Chapter 6: Superposition of Waves

Chapter 7: Wave Optics

Chapter 8: Electrostatics

Chapter 9: Current Electricity

Chapter 10: Magnetic Effect of Electric Current

Chapter 11: Magnetic materials

Chapter 12: Electromagnetic Induction

Chapter 13: AC Circuits

Chapter 14: Dual Nature Of Radiation And Matter

Chapter 15: Structure of Atoms and Nuclei

Chapter 16: Semiconductors Devices

## Chapter 10: Magnetic Effect of Electric Current

### 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

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

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)`

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

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

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

guass

tesla

oersted

Wb/m

^{2 }

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

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/m²8.0 × 10

^{-5}Wb/m²2.0 × 10

^{-3 }Wb/m^{2}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

What is Lorentz force?

What is Solenoid?

What is Toroid?

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

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?

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?

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

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.

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

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.

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?

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

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.

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

Explain the construction and working of the Moving coil Galvanometer.

Explain Biot Savart's Law.

A Rectangular coil of 10 turns, each of area 0.05 m^{2}, 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?

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

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.

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.

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.

## Chapter 10: Magnetic Effect of Electric Current

## 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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