Magnetic Field Lines

Q.

What are domains in magnetism ?

Q.

Draw the magnetic field lines representing uniform magnetic field. [2 MARKS]

Q.

State any two properties of magnetic field lines.

Q.

What is a magnetic field? How can the direction of magnetic field lines at a place be determined ?

Q. A current I is flows in an infinitely long wire withcrossection in the form of a semicircular ring of radius R.The magnitude of the magnetic induction along its axis s:

Q.

What is the direction of lines of force of earths magnetic field?

Q.

A plotting compass in placed near the south pole of a bar magnet. The pointer of plotting compass will :

(a) point away from the south pole

(b) point parallel to the south pole

(c) point towards the south pole

(d) point at right angles to the south pole

Q.

What are 3 methods of making magnets?

Q.

What is null point in magnetic field?

Q.

Maximum iron filings stick in the middle of a bar magnet when it is brought near them. (True or False)

1. True
2. False

Q.

(a) Define magnetic field lines. Describe an activity to draw a magnetic filed line outside a bar magnet from one pole to another pole.

(b) Explain why, a freely suspended magnet always points in the north-south direction.

Q.

Which of the following is not a property of magnetic field lines?

1. Magnetic field lines move from north pole to south pole inside a magnet

2. The relative strength of magnetic field is shown by the degree of closeness of magnetic field lines

3. Magnetic field lines form closed loops

4. Magnetic field lines can never cross each other

Q.

Which of the following is correct regarding the nature of parallel and anti-parallel currents?

1. Parallel currents repel and antiparallel currents attract.

2. Parallel currents attract and antiparallel currents repel.

3. No force exist due to both currents.

4. None of these.

Q.

(a) The diagram shown a bar magnet surrounded by four plotting compasses. Copy the diagram and mark in it the direction of the compass needle for each of the cases B, C and D.

(b) Which is the north pole, X or Y?

Q.

The number of magnetic lines of force passing normally through a surface is called as?

1. Electromagnetism

2. Surface magnetism

3. Magnetic lines of force

4. Magnetic flux

Q.

What is Difference between Solenoid and Inductor?

Q. 6. A charge +Q is uniformly distributed on a circular disc of radius R. The disc rotates with constant angular speed w about its own axis. The magnetic field at the centre of the disc is[assume that the disc is in the X-Y plane and rotates in anticlockwise direction]

Q. State the uses/applications of an electric motor.

Q. Draw magnetic field lines around a bar magnet.
List the properties of magnetic lines of force.

Q.

When iron filings are spread on a piece of paper and a bar magnet is kept below the paper, the filings ___.

1. arrange themselves in a random fashion

2. accumulate near the centre of the magnet

3. arrange themselves around the magnet in a particular pattern

4. gets pushed away from the paper

Q. Which of the following is an incorrect statement regarding the magnetic field?

1. Magnetic field lines form closed loops.
2. Inside a magnet, magnetic field lines moves from north to south pole.
3. Magnetic field lines do not intersect each other.
4. Magnetic filed lines originates from north pole.

Q. Statement 1: Current has a direction and magnitude so it is a vector.
Statement 2: All vectors obey the parallelogram law of vector addition

1. Statement 1 is correct, Statement 2 is the correct and Statement 2 is not the correct explanation of statement 1
2. Statement 1 is correct, Statement 2 is the correct and Statement 2 is the correct explanation for statement 1
3. Statement 1 is wrong but Statement 2 is correct
4. Both statements are wrong
5. Statement 1 is correct but Statement 2 is wrong

Q. State whether true or false :

1. True
2. False

Q.

What is the difference between electric field and magnetic field?

Q. When we break a magnet into two, both the pieces have N and S poles. What will happen if we repeat this furthwr and fuether until we reach the atomic level?

Q.

The correct order of magnetic field strength at the given points would be:

1. A > B = C

2. A > B > C

3. A = B = C

4. A < B < C

Q.

The intensity of a magnetic field is defined as the force experienced by a

1. standard compass

2. unit positive charge

3. unit negative charge

4. unit north pole

Q.

Which is more powerful a magnetic compass needle or a bar magnet?

Q.

Explain any three properties of magnetic field lines.

Q. Can we say, that Magnetic field lines tells the direction in which Magnetic field is Produced ?