Magnetism Question 19
Assertion : Reduction factor (K) of a tangent galvanometer helps in reducing deflection caused by current. Reason : Reduction factor decreases with increase of current.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason are both false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: C
Solution:
The reduction factor of tangent galvanometer is $ K=\frac{B _{H}}{G}=B _{H}\times \frac{2r}{n{\mu _{0}}} $ Thus reduction factor of a tangent galvanometer depends upon the geometry of its coil. It increases with increase of radius and decreases with increase in number of turns of the coil of the galvanometer.
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