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6. Electromagnetic induction — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics6. Electromagnetic induction1 Mark
MCQ
An aluminium ring $B$ faces an electromagnet $A$. The current I through $A$ can be altered
  • A
    Whether $I$ increases or decreases, $B$ will not experience any force
  • B
    If $I$ decrease, $A$ will repel $B$
  • C
    If $I$ increases, $A$ will attract $B$
  • ✓
    If $I$ increases, $A$ will repel $B$
✓

Answer

Correct option: D.
If $I$ increases, $A$ will repel $B$
d
(d) If current through $A$ increases, crosses $(X)$ linked with coil $B$ increases, hence anticlockwise current induces in coil $B$. As shown in figure both the current produces repulsive effect.

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