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Class X Chapter 13 – Magnetic Effects of Electric Current Science
Question 1:
Why does a compass needle get deflected when brought near a bar magnet?
Answer:
A compass needle is a small bar magnet. When it is brought near a bar magnet, its
magnetic field lines interact with that of the bar magnet. Hence, a compass needle
shows a deflection when brought near the bar magnet.
Question 1:
Draw magnetic field lines around a bar magnet.
Answer:
Magnetic field lines of a bar magnet emerge from the north pole and terminate at the
south pole. Inside the magnet, the field lines emerge from the south pole and terminate
at the north pole, as shown in the given figure.
Question 2:
List the properties of magnetic lines of force.
Answer:
The properties of magnetic lines of force are as follows.
(a) Magnetic field lines emerge from the north pole.
(b) They merge at the south pole.
(c) The direction of field lines inside the magnet is from the south pole to the north pole.
(d) Magnetic lines do not intersect with each other.
Question 3:
Why don’t two magnetic lines of force intersect each other?
Answer:
If two field lines of a magnet intersect, then at the point of intersection, the compass
needle points in two different directions. This is not possible. Hence, two field lines do
not intersect each other.
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(One Km from ‘Welcome Metro Station)
,Class X Chapter 13 – Magnetic Effects of Electric Current Science
Question 1:
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.
Answer:
Inside the loop = Pierce inside the table
Outside the loop = Appear to emerge out from the table
For downward direction of current flowing in the circular loop, the direction of magnetic
field lines will be as if they are emerging from the table outside the loop and merging in
the table inside the loop. Similarly, for upward direction of current flowing in the circular
loop, the direction of magnetic field lines will be as if they are emerging from the table
outside the loop and merging in the table inside the loop, as shown in the given figure.
Question 3:
How much energy is given to each coulomb of charge passing through a 6 V battery?
Answer:
The energy given to each coulomb of charge is equal to the amount of work required to
move it. The amount of work is given by the expression,
Head Office: 1/3-H-A-2, Street # 6, East Azad Nagar, Delhi-110051
(One Km from ‘Welcome Metro Station)
, Class X Chapter 13 – Magnetic Effects of Electric Current Science
Where,
Charge = 1 C
Potential difference = 6 V
Therefore, 6 J of energy is given to each coulomb of charge passing through a battery of
6 V.
Question 3:
Choose the correct option.
The magnetic field 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
Answer:
(d)The magnetic field inside a long, straight, current-carrying solenoid is uniform. It is
the same at all points inside the solenoid.
Head Office: 1/3-H-A-2, Street # 6, East Azad Nagar, Delhi-110051
(One Km from ‘Welcome Metro Station)
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