Science · Effects of current · chapter 12 of 13

Class 10 Science Chapter 12: Magnetic Effects of Electric Current Assertion-reason questions with answers

2 assertion-reason questions on Magnetic Effects of Electric Current, each with its answer and the reason, written from the NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter. Each question gives an Assertion (A) and a Reason (R); choose how they stand to each other.

Question 1
Assertion (A): A tiny compass moved about inside a long current-carrying solenoid, well away from its ends, points the same way at every position. Reason (R): The field lines inside a current-carrying solenoid are parallel straight lines, so the field is the same at all points inside it.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.

Both are true. Because the field inside the solenoid is uniform, the compass sets in the same direction everywhere inside, so R explains A.

Question 2
Assertion (A): The metal body of a table fan is connected to the earth wire. Reason (R): The earth wire in house wiring has green insulation.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Both are true. The body is earthed because the earth wire gives a low-resistance path that carries away any leakage of current, keeping the body at the earth's potential; the colour of the insulation does not explain this.

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