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Magnetic Effects of Electric Current — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMagnetic Effects of Electric Current1 Mark
MCQ
For two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
Assertion: In a conductor, free electrons keep on moving but no magnetic force acts on a conductor in a magnetic field.
Reason: Force on free electron due to magnetic field always acts perpendicular to its direction of motion.
  • A
    Both A and R are true, and R is correct explanation of the assertion.
  • B
    Both A and R are true, but R is not the correct explanation of the assertion.
  • C
    A is true, but R is false.
  • D
✓

Answer

  1. A is true, but R is false.

Explanation:

In a conductor, the average velocity of electrons is zero. Hence, no current flows through the conductor. Hence, no force acts on this conductor.

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