A moving coil galvanometer has 100 turns and a resistance of 10ohm. The coil is 5 cm long and 4 cm wide. A potential difference of 100mV produces a fu

Question

A moving coil galvanometer has 100 turns and a resistance of 10ohm. The coil is 5 cm long and 4 cm wide. A potential difference of 100mV produces a fu

A moving coil galvanometer has 100 turns and a resistance of 10ohm. The coil is 5 cm long and 4 cm wide. A potential difference of 100mV produces a full scale deflection ( the coil is turned through `60^@`). The flux density in the gap is `1000G`. The required torque of the controlling spring is
A. 1N m
B. 0.1 Nm
C. `1xx10^-2Nm`
D. `1xx10^-4Nm`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - D
`tau_(n)= n I AB costheta `
`=n (V)/(R ) l b B cos theta`.
`=(100xx100xx10^-3xx5xx10^-2xx4xx10^-2xx1000xx10^-4xxcos 60 )/(10)`
`=1xx10^-4N m`

4 views Answered 2023-02-05 15:29