The sensitivity of a galvanometer can be decreased by:
Correct answer: C. Increasing the c/BAN ratio
- A. Increasing magnetic field
- B. Increasing the number of turns of the coil
- C. Increasing the c/BAN ratio
- D. Decreasing the length of couple 'c'
Explanation
Sensitivity of a galvanometer is defined as the deflection per unit current. Increasing the magnetic field or the number of turns in the coil increases the sensitivity, as both enhance the torque that causes deflection. Decreasing the length of the couple 'c' also increases sensitivity by reducing the counteracting torque. However, increasing the c/BAN ratio, where 'c' is a constant related to the coil's resistance, 'B' is the magnetic field, 'A' is the area of the coil, and 'N' is the number of turns, results in a decreased sensitivity by reducing the deflection per unit current.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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