Magnetic Field and Field Lines

Q.

Choose the incorrect statement from the following regarding magnetic lines of the field:

1. The direction of the magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points.

2. Magnetic field lines are closed curves.

3. If magnetic field lines are parallel and equidistant, they represent zero field strength.

4. Magnetic field lines do not intersect each other

Q. The magnetic field around a magnet is the strongest at which points?

1. At the centre
2. At the poles
3. At the sides
4. Same throughout

Q.

A bar magnet is broken in half and the two pieces are separated. Which of the following diagrams shows the magnetic field lines from the two pieces?​

1. 

2. 

3. 

4. 

Q.

Oersted is a unit of

1. Dip

2. Magnetic intensity

3. Magnetic moment

4. Pole Strength

Q.

The magnetic field lines produced by a bar magnet originate from ___, in the region outside the magnet.

1. the south pole and end at its north pole

2. the north pole and end at its east pole

3. the south pole and end at its west pole

4. the north pole and end at its south pole

Q.

The degree of closeness of magnetic field lines represents

1. magnetic type

2. magnetic strength

3. magnetic polarity

4. magnetic induction

Q.

What conclusion is drawn regarding the magnetic field at a point if a compass needle at that point rests in any dirction ? Give reason for your answer.

Q.

Choose the incorrect statement from the following regarding magnetic lines of the field

1. The direction of the magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points

2. Magnetic field lines are closed curves

3. If magnetic field lines are parallel and equidistant, they represent zero-field strength

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

Q. is a type of natural magnet.

1. Bar magnet
2. Lodestone
3. Horseshoe magnet
4. Soft iron

Q.

Tangent drawn on a magnetic field line at a point gives the direction of the field at that point.

1. True
2. False

Q.

The magnetic field exists around:-

1. Iron

2. Aluminium

3. Static charges

4. Moving charges

Q.

What do you understand by the term magnetic field lines ?

Q.

__________ is a natural magnet while bar magnet is _________ magnet.

Q.

A dielectric develops a ________ in an external electric field.

1. Net dipole moment

2. Zero dipole moment

3. Zero charge separation

4. Positive charge

Q.

Magnetic field lines represent uniform field strength when they

1. The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points
2. If magnetic field lines are parallel and equidistant, they represent zero field strength
3. Relative strength of magnetic field is shown by the degree of closeness of the field lines
4. Magnetic field lines are closed curves

Q.

It is a common notion that the earths magnetism is due to the

1. presence of a huge permanent magnet in the interior of earth

2. presence of electric currents circulating in the interior of the earth.

3. presence of ions in the atmosphere due to which currents are caused as the earth rotates

4. influence of a nuclear explosion.

Q. A magnetic object will get affected by the magnetic field of a bar magnet, if it is placed ________ the magnet.

1. on the right side of
2. anywhere near
3. on the left side of
4. on the top of

Q.

Which of the following does not affect the magnetic properties of a permanent magnet?

1. Radiation

2. Heat

3. Other magnets in close proximity to the magnet

4. Painting

Q.

Question 2(b)
In Activity 13.7, how do we think the displacement of rod AB will be affected if
(ii) a stronger horse-shoe magnet is used

Q.

The magnetic field lines are denser near the poles of a magnet.

1. True

2. False

Q.

______ is a naturally occurring magnet

Q.

Which of the following statements regarding the magnetic field produced by a bar magnet is incorrect?

1. Magnetic field lines are continuous in nature

2. Magnetic field lines have both magnitude and direction

3. Magnetic field lines intersect each other at the poles of a bar magnet

4. Magnetic field lines are stronger at the poles and weaker near the centre of a bar magnet

Q. Straight current carrying conductors produce magnetic fields around them.

1. concentric, circular
2. parallel
3. intersecting

Q.

define magnetic charge

Q.

Can two or more magnetic field lines intersect at a point?

Q.

The energy that resides in a current carrying inductor is in the form of a ___.

1. magnetic field
2. electrostatic field
3. gravitational field
4. resistive field

Q.

Crowded field lines represent .......... magnetic field

Q.

When two magnets are placed closed to each other, north pole of one magnet gets attracted to the south pole of the other magnet.

1. False

2. True

Q.

what is a magnetic flux?

Q.

state gauss theo. in magnetism