Q20
1 markMCQSection A

Assertion (A) : The deflection of a compass needle placed near a current carrying wire decreases when the magnitude of an electric current in the wire is increased.

Reason (R) : Strength of the magnetic field at a point due to a current carrying conductor increases on increasing the current in the conductor.

Magnetic Effects of Electric Current
Magnetic Field due to a Current through a Straight Conductor

Options

(A)Both (A) and (R) are true and (R) is the correct explanation of (A).
(B)Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C)(A) is true, but (R) is false.
(D)(A) is false, but (R) is true.
Official Answer

The assertion is false, but the reason is true.

deflectioncompass needlecurrentmagnetic field

Marking Scheme

  • 11 mark

Hint

The deflection of the compass needle increases with the increase in current.

Quick Oral Answer

The assertion is false, but the reason is true.

Analysis & Explanation

The deflection of a compass needle placed near a current-carrying wire increases when the magnitude of the electric current in the wire is increased. This is because the strength of the magnetic field at a point due to a current-carrying conductor increases on increasing the current in the conductor.

Common Mistakes

  1. 1thinking that the deflection of the compass needle decreases with the increase in current

Interesting Facts

The strength of the magnetic field produced by a current-carrying conductor can be increased by increasing the current in the conductor.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2024?

This question carries 1 mark in the CBSE Class 10 Science 2024 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Magnetic Effects of Electric Current" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Magnetic Field due to a Current through a Straight Conductor" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2024 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2024 paper.