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Magnetic Effects of Electric Current — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMagnetic Effects of Electric Current1 Mark
MCQ
A rectangular loop carrying a current is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If a steady current its created in wire as shown in figure below, then the loop will
  • A
    Rotate about an axis parallel to the wire.
  • ✓
    Move towards the wire.
  • C
    Move away from the wire or towards right.
  • D
    Remains stationary.
✓

Answer

Correct option: B.
Move towards the wire.
According to the Lenz’s Law As two like currents attract and unlike currents repel each other, the wire will attract the side of the loop near the wire and parallel to it and the far side of the loop again parallel to the wire will be repelled. But the force of attraction will be more as that side of the loop is closer to the wire and so effectively the current loop will move towards the wire.

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