EASY
10th CBSE
IMPORTANT
Earn 100

What is the role of a fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?

Important Questions on Magnetic Effects of Electric Current

EASY
10th CBSE
IMPORTANT
Core Science Physics>Chapter 4 - Magnetic Effects of Electric Current>EXERCISE - 4B>Q 10
Name four appliances where in an electric motor, a rotating device that converts electrical energy to mechanical energy, is used as an important component. In what respect are motors different from generators?
EASY
10th CBSE
IMPORTANT
Core Science Physics>Chapter 4 - Magnetic Effects of Electric Current>EXERCISE - 4B>Q 11
What is the role of the two conducting stationary brushes in a simple electric motor?
MEDIUM
10th CBSE
IMPORTANT
Core Science Physics>Chapter 4 - Magnetic Effects of Electric Current>EXERCISE - 4B>Q 12
What is the difference between a direct current and an alternating current? How many times does AC used in India change direction in one second?
MEDIUM
10th CBSE
IMPORTANT
Core Science Physics>Chapter 4 - Magnetic Effects of Electric Current>EXERCISE - 4B>Q 1
The north pole of a powerful bar magnet is rapidly taken inside an insulated copper coil whose ends are connected to a sensitive galvanometer. Answer the following questions :
(a) What is your observation when the magnet is moving with respect to the coil?
(b) What is your observation when the magnet stops with respect to the coil?
(c) What is your observation when the magnet is rapidly pulled out of the coil?
MEDIUM
10th CBSE
IMPORTANT
Core Science Physics>Chapter 4 - Magnetic Effects of Electric Current>EXERCISE - 4B>Q 1

The north pole of a powerful bar magnet is rapidly taken inside an insulated copper coil whose ends are connected to a sensitive galvanometer. Answer the following questions :
(a) What is your observation when the magnet is moving with respect to the coil?
(b) What is your observation when the magnet stops with respect to the coil?
(c) What is your observation when the magnet is rapidly pulled out of the coil?

Give an explanation of your observations.

MEDIUM
10th CBSE
IMPORTANT
Core Science Physics>Chapter 4 - Magnetic Effects of Electric Current>EXERCISE - 4B>Q 1
Name and state the law which determines the direction of the induced current in the coil. 
MEDIUM
10th CBSE
IMPORTANT
Core Science Physics>Chapter 4 - Magnetic Effects of Electric Current>EXERCISE - 4B>Q 1
(iv) How the magnitude of induced current changes, when :
(a) A more powerful magnet is used.
(b) The relative motion of the magnet with respect to the coil increases.
(c) The number of turns in the copper coil are increased.
EASY
10th CBSE
IMPORTANT
Core Science Physics>Chapter 4 - Magnetic Effects of Electric Current>EXERCISE - 4B>Q 2
What do you understand by the terms; (i) alternating; (ii) direct current? Explain your answer by drawing graphical diagrams.