NCERT Solutions for Chapter: Chemical Effects of Electric Current, Exercise 4: LONG ANSWER QUESTIONS

Observe the circuit given in Figure.

Boojho set up this circuit for purification of copper. What will be the nature of - (i) plate $\mathrm{A}$ (ii) plate $\mathrm{B}$ (iii) the solution. Explain the process of purification.

Observe the following circuit given in figure.

Current does not flow in the circuit if there is a gap between the two wires. Does it indicate that air is a poor conductor of electricity? Does air never conduct electricity? Explain.

Boojho made the circuit shown in figure. He wanted to observe what happens when an electric current is passed through water. But he forgot to add a few drops of lemon juice to water. Will it make any difference to his observations? Explain.

Observing that the bulb does not glow in the circuit shown in Figure A, Boojho changed the circuit as shown in Figure B. He observed deflection in the magnetic compass.

What does the deflection in magnetic compass indicate?

Observing that the bulb does not glow in the circuit shown in Figure A, Boojho changed the circuit as shown in Figure B. He observed deflection in the magnetic compass.

Why did the bulb not glow in Figure A.

Observing that the bulb does not glow in the circuit shown in Figure A, Boojho changed the circuit as shown in Figure B. He observed the deflection in the magnetic compass.

What would be the effect of the increase in the number of turns in the coil wound around the magnetic compass in Figure B?

Observing that the bulb does not glow in the circuit shown in Figure A, Boojho changed the circuit as shown in Figure B. He observed the deflection in the magnetic compass.

What will be observed if the number of cells is increased in the circuit shown in figure B?

You are provided with a magnetic compass, an empty matchbox, a battery of two cells and connecting wires. Using these objects how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.