Electromagnetic Induction (Fleming's Right-Hand Rule) MCQs

Q1. In Fleming's left-hand rule, which finger points in the direction of the magnetic field?

• A.The forefinger (first finger)
• B.The middle finger
• C.The thumb
• D.The little finger

Answer: A. The forefinger (first finger)

Q2. Consider the following statements about electromagnetic induction: (I) A changing magnetic flux induces a current. (II) Faraday discovered electromagnetic induction. (III) A steady magnetic field induces a large current. Which of the above statement(s) is/are correct?

• A.None of these
• B.Only I and II
• C.Only I
• D.Only III

Answer: B. Only I and II

NCERT fact (physics, chapter 'Magnetic Effects of Electric Current'): Correct: I, II. Why option B fits - Correct. Distractor analysis: option A) 'None of these' is wrong because Re-check each statement individually; option C) 'Only I' is incorrect: Re-check each statement individually. Final answer - B) Only I and II.

Q3. Induction is the principle of a:

• A.fuse
• B.motor
• C.heater
• D.generator

Answer: D. generator

Eliminate first - option A) 'fuse' is wrong because A fuse uses heating; option B) 'motor' is wrong because A motor uses the force; option C) 'heater' is wrong because A heater uses heating. That leaves only option D). Confirm with the chapter rule: An ionic bond forms when a metal donates electrons to a non-metal: e.g. Na -> Na+ + e-, Cl + e- -> Cl-, and Na+ + Cl- -> NaCl; the resulting solid is held by strong electrostatic attraction => this fixes the property asked in the stem; hence the answer = generator (physics, chapter 'Magnetic Effects of Electric Current'). Answer: D) generator.