B) Answer the following in one sentence.
i) What is solenoid?
ii) What is electric motor?
iii) Name the types of electric generator.
Answers
Explanation:
Why does a compass needle get deflected when brought near a bar magnet?
Ans. A compass needle is a small bar magnet with north and south pole. The compass needle deflects due to repulsion/attraction with the bar magnet.
2. Draw magnetic field lines around a bar magnet.
Ans.
3. List the properties of magnetic lines of force.
Ans. Properties of magnetic field lines of force:
(i) Magnetic field lines travel from N-pole of magnet towards 5-pole, outside the magnet and from S-pole to N-pole inside the magnet.
(ii) The strength of magnet/magnetic field is given by how close the field lines are if the field lines are closer magnet is stronger.
(iii) No two magnetic field lines ever intersect each other.
4. Why don’t two magnetic lines of force intersect each other?
Ans. The magnetic field lines never intersect each other as an intersection of the field lines means the magnetic field at that point has two directions, which is not possible because the resultant force on a pole (north/south) at any point can only be in one direction.
5. Consider a circular loop of wire lying in the plane of. the table. Let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.
Ans.
6. The magnetic field in a given region is uniform. Draw a diagram to represent it.
Ans.
The magnetic field in a given region is uniform can be represented by showing parallel lines at equidistance.
7. Choose the correct option.
The magnetic Meld inside a long straight solenoid-carrying current
(a) is zero.
(b) decreases as we move towards its end.
(c) increases as we move towards its end.
(d) is the same at all points.
Ans. (d) is the same at all points.
8. Which of the following property of a proton can change while it moves freely in a magnetic field?
(There may be more than one correct answer).
(a) mass
(b) speed
(c) velocity
(d) momentum
Ans. Velocity and momentum
9. In activity 13.7 (on page 234) how do we think the displacement of rod AB will be affected if
(i) current in rod AB is increased
(ii) a stronger horse-shoe magnet is used and
(iii) length of the rod AB is increased.
Ans. (i) If current in rod AB is increased its displacement will increase.
(ii) If a stronger horse-shoe magnet is used then the displacement of rod AB will increase.
(iii) If the length of the rod AB is increased force acting on it will increase and the displacement of the rod also increases.
10. A positively charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is
(a) towards south
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