R C Sethi Solutions for Chapter: Electricity and Magnetism, Exercise 3: EVALUATE YOUR UNDERSTANDING

An electric circuit must be made up of __________.

State if the statement is true or false. Correct the false statement.

An insulator readily allows an electric current to pass through it.

State if the statement is true or false. Correct the false statement.

State if the statement is true or false. Correct the false statement.

State if the statement is true or false. Correct the false statement.

Observe the circuit given below showing three incandescent bulbs $X, Y$ and $Z$ connected to a battery. If bulb $Y$ gets fused, which of the two remaining bulbs will keep on glowing? Justify your answer.

Sohail hung an object A on a spring as shown in the figure given below. He placed an electromagnet below A and recorded the length of the spring. He repeated the experiment with objects $B$ and $C$.

The table below shows the length of the spring when the switch was ON.

(a) Which of the three objects is definitely a magnet?

(b) How did you conclude the above result?

(c) What can you say about the property of the material used to make object $C$? Justify your answer.

Observe the circuit given below showing two incandescent bulbs $X$ and $Y$ connected to three batteries and a key. If the key is closed, what will happen to bulbs $X$ and $Y$.