Tag: properties of magnet

Questions Related to properties of magnet

A freely suspended magnet rests in the geographic ................... direction.

  1. $north -west$

  2. $north -south$

  3. $east -west$

  4. $west -north$


Correct Option: B
Explanation:

A freely suspended magnet rests in the geographic north-south direction.
Earth has two geographic poles, the North Pole and the South Pole. They are the places on Earth's surface that Earth's imaginary spin axis passes through. Our planet also has two magnetic poles, the North Magnetic Pole and the South Magnetic Pole just like a bar magnet. The magnetic poles are near, but not quite in the same places as, the geographic poles. The needle in a compass points towards a magnetic pole. Earth's North Magnetic Pole is actually the south pole of the Earth's geographic poles and vice-versa.
Hence, a freely suspended magnetic needle point in geographic north-south direction. The magnetic compass is the device that uses this principle. A magnetic compass contains a magnetic needle pivoted in a horizontal plane that indicates the direction of magnetic north at points on the earth's surface. It is an instrument that uses a magnetized steel bar to indicate direction relative to the earth's magnetic poles.

Given below are two statements, Which of the statements is/are true?
Statement A: When the south pole of a magnet points towards the geographic north pole, the null points are along the equatorial line.
Statement B: At the null point, the earth's magnetic field is zero

  1. A is true, B is false

  2. Both A and B are false

  3. A is false, B is true

  4. Both A and B are true.


Correct Option: B

What is our best evidence that earth has a magnetic field?

  1. All things fall towards earth's centre.

  2. A compass needle lines up with it.

  3. Winds blow from east to west.

  4. Earth's oceans all have currents.


Correct Option: B
Explanation:

The best evidence is to test it by taking a direction compass and seeing it where the north position will point and you will see that it will always point to the north and south pole.Image result for compass direction

By which of the following property of magnet, one can determine the direction?

  1. A magnet attracts magnetic materials towards itself

  2. A freely suspended bar magnet always aligns in the north-south direction

  3. A magnet with a single pole does not exist

  4. Any one of the above


Correct Option: B
Explanation:

The north pole of the normal magnet points in the north direction of the earth. Thus by suspending a bar magnet freely, it aligns in the north-south direction.

The noth ends of the compass needle point approximately towards

  1. north pole

  2. south pole

  3. equator

  4. all


Correct Option: A
Explanation:

The north end of compass needle points approximately towards north pole, which is geographic north of the earth , which is south pole of earth's magnet as per convection and attraction law.

The south seeking end is called _______ pole.

  1. North

  2. South

  3. East

  4. West


Correct Option: B
Explanation:

The north-seeking pole of the magnet, or simply the north pole. The opposite end is called the south pole.

Image result for The south seeking end is called

A compass needle is a/an

  1. iron piece

  2. electromagnet

  3. small magnet

  4. none


Correct Option: C
Explanation:
A compass needle points north as the north pole of the magnet inside it is attracted to the south pole of earth's built in magnet.
Thus compass needle is a magnet.

For finding the direction using magnet, we need to find which of the following direction first?

  1. East

  2. West

  3. North

  4. South


Correct Option: C
Explanation:

The north pole of the normal magnet points in the north direction of the earth. Thus north direction is found first with the help of the magnet..

Bar magnets always align themselves in the North-South direction when suspended freely in air.

  1. True

  2. False


Correct Option: A
Explanation:

A freely suspended magnet always points in the north south direction as earth behaves as large magnet. the north pole of the earth's magnet attracts the south pole of the magnet and vice versa.

Note: The north pole of earth's magnet is in geographical south because it attracts the south pole of the suspended magnet.

A small plotting compass can be used to plot a magnetic field because 

  1. the compass needle is freely suspended magnet

  2. the compass needle is easily demagnetized

  3. there is a vacuum inside the case of the compass

  4. the Earth's magnetic field has no effect on the needle


Correct Option: A
Explanation:

The compass needle acts as a freely suspended magnet which points in north-south direction under the influence of earth's magnetic field lines. So, a small plotting compass can be used to plot a magnetic field.