# Balbharati solutions for Physics 11th Standard Maharashtra State Board chapter 12 - Magnetism [Latest edition]

#### Chapters ## Chapter 12: Magnetism

Exercises
Exercises [Pages 227 - 288]

### Balbharati solutions for Physics 11th Standard Maharashtra State Board Chapter 12 Magnetism Exercises [Pages 227 - 288]

Exercises | Q 1. (i) | Page 227

Choose the correct option.

Let r be the distance of a point on the axis of a bar magnet from its center. The magnetic field at r is always proportional to

• 1/"r"^2

• 1/"r"^3

• 1/"r"

• not necessarily 1/"r"^3 at all points

Exercises | Q 1. (ii) | Page 227

Choose the correct option.

Magnetic meridian is the plane

• perpendicular to the magnetic axis of Earth

• perpendicular to geographic axis of Earth

• passing through the magnetic axis of Earth

• passing through the geographic axis

Exercises | Q 1. (iii) | Page 227

Choose the correct option.

The horizontal and vertical component of magnetic field of Earth are same at someplace on the surface of Earth. The magnetic dip angle at this place will be

• 30°

• 45°

• 90°

Exercises | Q 1. (iv) | Page 228

Choose the correct option.

Inside a bar magnet, the magnetic field lines

• are not present

• are parallel to the cross-sectional area of the magnet

• are in the direction from N pole to S pole

• are in the direction from S pole to N pole

Exercises | Q 1. (v) | Page 228

Choose the correct option.

A place where the vertical components of Earth's magnetic field is zero has the angle of dip equal to

• 45°

• 60°

• 90°

Exercises | Q 1. (vi) | Page 228

Choose the correct option.

A place where the horizontal component of Earth's magnetic field is zero lies at

• geographic equator

• geomagnetic equator

• one of the geographic poles

• one of the geomagnetic poles

Exercises | Q 1. (vii) | Page 228

Choose the correct option.

A magnetic needle kept nonparallel to the magnetic field in a nonuniform magnetic field experiences

• a force but not a torque

• a torque but not a force

• both a force and a torque

• neither force nor a torque

Exercises | Q 2. (i) | Page 228

Answer the following question in brief.

What happens if a bar magnet is cut into two pieces transverse to its length/along its length?

Exercises | Q 2. (ii) | Page 228

Answer the following question in brief.

What is the unit of Magnetic Intensity?

Exercises | Q 2. (iii) | Page 228

Answer the following question in brief.

What could be the equation for Gauss' law of magnetism, if a monopole of pole strength p is enclosed by a surface?

Exercises | Q 3. (i) | Page 228

Answer the following question in detail.

Explain Gauss's law for magnetic fields.

Exercises | Q 3. (ii) | Page 228

Answer the following question in detail.

What is a geographic meridian?

Exercises | Q 3. (ii) | Page 228

Answer the following question in detail.

How does the magnetic declination vary with latitude? Where is it minimum?

Exercises | Q 3. (iii) | Page 228

Answer the following question in detail.

Define the Angle of Dip.

Exercises | Q 3. (iii) | Page 228

Answer the following question in detail.

What happens to the angle of dip as we move towards magnetic pole from magnetic equator?

Exercises | Q 4. (i) | Page 228

Solve the following problem.

A magnetic pole of a bar magnet with a pole strength of 100 A m is 20 cm away from the centre of a bar magnet. The bar magnet has a pole strength of 200 A m and has a length of 5 cm. If the magnetic pole is on the axis of the bar magnet, find the force on the magnetic pole.

Exercises | Q 4. (ii) | Page 288

Solve the following problem.

A magnet makes an angle of 45° with the horizontal in a plane making an angle of 30° with the magnetic meridian. Find the true value of the dip angle at the place.

Exercises | Q 4. (iii) | Page 228

Solve the following problem.

Two small and similar bar magnets have a magnetic dipole moment of 1.0 Am2 each. They are kept in a plane in such a way that their axes are perpendicular to each other. A line drawn through the axis of one magnet passes through the center of other magnet. If the distance between their centers is 2 m, find the magnitude of the magnetic field at the midpoint of the line joining their centers.

Exercises | Q 4. (iv) | Page 228

Answer the following question in detail.

A circular magnet is made with its north pole at the centre, separated from the surrounding circular south pole by an air gap. Draw the magnetic field lines in the gap.

Exercises | Q 4. (iv) | Page 228

Answer the following question in detail.

Draw a diagram to illustrate the magnetic lines of force between the south poles of two such magnets.

Exercises | Q 4. (v) | Page 228

Answer the following question in detail.

Two bar magnets are placed on a horizontal surface. Draw magnetic lines around them. Mark the position of any neutral points (points where there is no resultant magnetic field) on your diagram.

## Chapter 12: Magnetism

Exercises ## Balbharati solutions for Physics 11th Standard Maharashtra State Board chapter 12 - Magnetism

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Concepts covered in Physics 11th Standard Maharashtra State Board chapter 12 Magnetism are Introduction to Magnetism, Magnetic Lines of Force and Magnetic Field, The Bar Magnet, Gauss' Law of Magnetism, The Earth’s Magnetism.

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