| ASSERTION: A tangent galvanometer is used for measuring current. |
| REASON: Tangent galvanometer reads current directly. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: C
Solution :
A tangent galvanometer is certainly used for measuring very small current, but it does not read current Directly. Current is calculated from \[I=\frac{2a}{N{{\mu }_{0}}}{{B}_{H}}\,\tan \theta \] Where a is radius and N is is turns of a coil. \[{{B}_{H}}\] is horizontal component of earth's magnetic field, \[\theta \]is deflection of the needle.
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