Which of the following statements is incorrect? The sensitivity of a galvanometer which incorporates an optical lever arrangement may be increased by providing
a larger number of turns in the coil
a thinner suspension with a small torsional control
a special alloy permanent magnet which gives a high magnetic flux
all of the above
a light source with a greater intensity
Explanation
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The correct answer is:
✅ E. a light source with a greater intensity
Explanation:
The sensitivity of a galvanometer (which measures small electric currents) can be increased by:
Increasing the number of turns in the coil → More turns generate a stronger response to small currents. ✅
Using a thinner suspension with small torsional control → This reduces resistance to movement, making the device more sensitive. ✅
Using a strong permanent magnet with high magnetic flux → A stronger magnetic field increases the deflection of the coil. ✅
However, increasing the intensity of the light source does not affect the sensitivity of the galvanometer itself. The light source is only used in the optical lever arrangement (to reflect off a mirror and display deflection), but making it brighter does not improve the measurement accuracy. ❌
Thus, the incorrect statement is:
✅ E. a light source with a greater intensity.
this question is supposed to be "which of the following statement is incorrect?"
if you check the my school website on Google,the answer is E,which explains it more
E is the answer as per say the question
But if they which of the following is correct then D is the answer
since only Option A,b and c are related to sensitivity in galvanometer While option D says all is correct means D is the one wrong cos option E is not among all
