If the Earth's magnetic field at the equator is about 4 × 10 - 5 T , what is its approximate magnetic dipole moment? (radius of earth = 6400 km )

The equatorial magnetic field is given by B = μ 0 4 π m r 3 where m is magnetic dipole moment r is radius of earth μ 0 is magnetic constant permeability of free space vacuum ∴ m = 4 π B r 3 μ 0 ⇒ m = 4 π × 4 × 10 - 5 × ( 6400 × 10 3 ) 3 4 π × 10 - 7 = 1 . 05 × 10 23 Hence, magnetic dipole moment is 1 . 05 × 10 23 Am 2 .

Classify the following materials with regard to magnetism: Manganese, cobalt, Nickel, Bismuth, Oxygen, Copper.

Paramagnetic materials. The materials which are not strongly attracted to a magnet are known as paramagnetic material. Diamagnetic materials. The materials which are repelled by a magnet such as zinc. Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets. Most of the ferromagnetic materials are metals. From given materials, manganese and oxygen are paramagnetic materials. Cobalt and nickel are ferromagnetic materials. Bismuth and copper are the diamagnetic materials.

What is the magnetic moment associated with a solenoid?

A solenoid is a coil with a length greater than its diameter and is a type of electromagnet to produce controlled magnetic fields by passing an electric current through it. Magnetic moment is defined as the property of a magnet that interact with an applied field to give a mechanical moment. The magnetic moment of Solenoid, m = N I A Where N is the number of turns, I is solenoid current and A is the cross sectional area of the solenoid.

E M B I B E

Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 5

EASY

12th Andhra Pradesh Board

IMPORTANT

Earn 100

Define magnetic susceptibility of a material. Name two elements-one having positive susceptibility and other having negative susceptibility.

Important Questions on Magnetism and Matter

EASY

12th Andhra Pradesh Board

IMPORTANT

Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 6

State Gauss's law for magnetism.

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 7

What do you understand by "hysteresis"? How does this property influence the choice of materials used in different appliances where electromagnets are used?

MEDIUM

12th Andhra Pradesh Board

IMPORTANT

Intermediate Second Year Physics>Chapter 8 - Magnetism and Matter>MODEL QUESTIONS (IPE PATTERN)>Q 1

What is the torque acting on a plain coil of