Copper wires of the same length and thickness are connected to points

1.	Copper wires of the same length and thickness are connected to points A and B in all the three circuits. In-circuit (a) copper wire is not coiled. In circuits (b) and (c), the copper wire is coiled. Observe the circuits and answer the following questions.a. When circuit (a) is switched on, what do you observe? b. When circuit (b) is switched on, what change do you observe in the intensity of light? Justify your answer.c. When circuit (c) is switched on, what change do you observe in the intensity of light? Justify your answer.
Answer» a. Bulb glows. b. No change in the intensity of light. There is no back emf produced as DC current is used in the circuit. c. Intensity of light decreases. Back emf is produced in the circuit as A.C current flows through it and current is decreased.

Copper wires of the same length and thickness are connected to points A and B in all the three circuits. In-circuit (a) copper wire is not coiled. In circuits (b) and (c), the copper wire is coiled. Observe the circuits and answer the following questions.a. When circuit (a) is switched on, what do you observe? b. When circuit (b) is switched on, what change do you observe in the intensity of light? Justify your answer.c. When circuit (c) is switched on, what change do you observe in the intensity of light? Justify your answer.

Answer»

a. Bulb glows.

b. No change in the intensity of light. There is no back emf produced as DC current is used in the circuit.

c. Intensity of light decreases. Back emf is produced in the circuit as A.C current flows through it and current is decreased.

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