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Magnetic Effects of Electric Current — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMagnetic Effects of Electric Current1 Mark
MCQ
In the followin questions, a statement of Assertion is given by to corresponding statement of Reason. Of the statement mark the correct answer as :
Assertion : In an $AC$ generator slip $-$ rings type of commutator is used.
Reason : Slip $-$ rings are full rings with which the ends of coil are in contact.
  • A
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • ✓
    If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
  • C
    If Assertion is true, but Reason is false.
  • D
    If Assertion is false, but Reason is true.
✓

Answer

Correct option: B.
If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
The two parts $S_1$ and $S_2$ of the split ring are used to act as a commutator to reverse the direction of current in the coil, so they are called the split ring commutator. So, slip rings are used with simple $a.c.$ generators, whereas a commutator is used with $d.c.$ motors.

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