Page No 224:
Question 1:
Why does a compass needle get deflected when brought near a bar magnet?
Page No 231:
Question 1:
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
Page No 232:
Question 2:
In Activity 13.7 (page: 230), 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?
Page No 238:
Question 2:
An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.
Page No 238:
Question 3:
What precaution should be taken to avoid the overloading of domestic electric circuits?
Page No 241:
Question 8:
How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain.
Page No 241:
Question 9:
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
Page No 241:
Question 10:
Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?
Page No 241:
Question 11:
Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?
Page No 241:
Question 13:
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil, (ii) withdrawn from inside the coil, (iii) held stationary inside the coil?
Page No 241:
Question 14:
Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
Page No 241:
Question 16:
Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?
Page No 241:
Question 18:
What is the function of an earth wire? Why is it necessary to earth metallic appliances?
