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MODEL PAPER 4 — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER 41 Mark
Question
Assertion (A): Deflection of the iron filings changes when current in the conductor varies.
Reason (R): Magnitude of the magnetic field does not change with the magnitude of current.
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Answer

(c) A is true but R is false.
Explanation: Assertion is correct but the reason is wrong. As the current changes in the conductor, magnitude of the magnetic field produced also vanes which is the reason for a change in the deflection of the iron filings.

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