HARD

12th ICSE

IMPORTANT

Earn 100

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?

Important Questions on Torque on a Current-Loop : Moving-Coil Galvanometer

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 8 - Torque on a Current-Loop : Moving-Coil Galvanometer>QUESTIONS>Q 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?

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 8 - Torque on a Current-Loop : Moving-Coil Galvanometer>QUESTIONS>Q 10

A moving coil galvanometer has a coil of resistance

59 Ω

. It shows a full scale deflection for a current of

50 m A

. How will you convert it to an ammeter having a range of

0

3 A

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 8 - Torque on a Current-Loop : Moving-Coil Galvanometer>QUESTIONS>Q 11

A galvanometer has a resistance of

100 Ω

. A PD of

100 mV

between its terminals gives a full-scale deflection. Calculate the shunt resistance required to convert the galvanometer into an ammeter reading up to

5 A

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 8 - Torque on a Current-Loop : Moving-Coil Galvanometer>QUESTIONS>Q 12

A galvanometer of resistance

99 Ω

gives a full-scale deflection for a current of

50 mA

. Find the value of the shunt

(in Ω)

required to convert it into an ammeter reading up to a maximum current of

5 A

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 8 - Torque on a Current-Loop : Moving-Coil Galvanometer>QUESTIONS>Q 13

The resistance of a galvanometer is

30 Ω

and it has

100

divisions on the scale. A current of

0.2 mA

produces a deflection of

1

division. The shunt(in

Ω

) required for measuring a current of

5 A

n

. Write the value of

100 n

to the nearest integer.

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 8 - Torque on a Current-Loop : Moving-Coil Galvanometer>QUESTIONS>Q 14

80 Ω

galvanometer shows a deflection of

1

division per mA. It has

50

divisions on its scale. If a shunt of

2.5 Ω

be attached to the galvanometer, what maximum current(in

A

) will this galvanometer measure?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 8 - Torque on a Current-Loop : Moving-Coil Galvanometer>QUESTIONS>Q 15

The coil of a galvanometer has a resistance of

100 Ω

. It shows full-scale deflection for a current of

5 \times 10^{- 4} A

. To convert it into a voltmeter to read a maximum potential difference of

5 V

, resistance(in

Ω

) added in the series is

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 8 - Torque on a Current-Loop : Moving-Coil Galvanometer>QUESTIONS>Q 16

50 Ω

resistance galvanometer has

25

divisions on its scale. On sending a current of

4.0 \times 10^{- 4} A

in it, the pointer gives a deflection of

1

division. How much resistance should be connected in series with the galvanometer to convert it into a voltmeter of

2.5 V

range?

Important Questions on Torque on a Current-Loop : Moving-Coil Galvanometer

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