Moving Coil Galvanometer and Voltage Current Sensitivities Numerical Class-12 Nootan ISC Physics Solution Ch-8 Torque on a Current-Loop : Moving coil Galvanometer. Step by step solutions of Kumar and Mittal Physics of Nageen Prakashan as council latest prescribe guideline for upcoming exam. Visit official Website CISCE for detail information about ISC Board Class-12 Physics.
Moving Coil Galvanometer and Voltage Current Sensitivities Numerical Class-12 Nootan ISC Physics Solution Ch-8 Torque on a Current-Loop : Moving coil Galvanometer
| Board | ISC |
| Class | 12 |
| Subject | Physics |
| Book | Nootan |
| Chapter-8 | Torque on a Current-Loop : Moving coil Galvanometer. |
| Topics | Moving Coil Galvanometer and Voltage Current Sensitivities Numerical |
| Academic Session | 2025-2026 |
Moving Coil Galvanometer and Voltage Current Sensitivities Numerical
Que-8. A moving-coil galvanometer has its coil of 24 turns and 12 Ω resistance. By how much the number of turns should be increased so that the current-sensitivity of the galvanometer increases by 25%? If, in doing so, the resistance of the coil increases to 20 Ω, what will be the effect on the voltage-sensitivity of the galvanometer?
Ans-
Current sensitivity (Q/i) = NBA/C
New current sensitivity
=> NBA/C x 125/100 = 5 NBA/4 C
=> N’ BA / C (where N’ = 5 N/4)
N’ = 5 x 24 / 4 = 30
again voltage sensitivity
= θ/V = NBA/RC = NBA/12 C
new voltage sensitivity
=> 5 NBA / 4 x 20 C (R changes from 12 to 20)
=> NBA/16 C
∴ percentage decrease = (NBA/12 C – NBA/16 C) / (NBA/12 C)
=> 25 %
Turns must be increased from 24 to 30; voltage-sensitivity will fall by 25%.
Que-9. To increase the current-sensitivity of a moving-coil galvanometer by 50%, its resistance is increased so that the new resistance becomes twice its initial resistance. By what factor does its voltage-sensitivity change?
Ans- Current sensitivity
θ/i = NBA/C
new current sensitivity
=> NBA/C x 150/100 = 3 NBA/2 C
initial voltage sensitivity
=> θ/V = NBA/RC
new voltage sensitivity
=> 3 NBA / 2 R.2C = 3 NBA/4 RC
=> 3/4 of initial voltage sensitivity
0.75 of initial sensitivity .
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