Advertisements
Advertisements
प्रश्न
Define the term 'current sensitivity' of a moving coil galvanometer.
उत्तर
Current sensitivity of a galvanometer is defined as the deflection produced in the galvanometer when a unit current flows through it.
Mathematically it can be given by:
`I_S = (NBA)/k`
where k is the couple per unit twist.
APPEARS IN
संबंधित प्रश्न
Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer?
Explain how moving coil galvanometer is converted into a voltmeter. Derive the necessary formula.
State the principle of the working of a moving coil galvanometer, giving its labeled diagram ?
A moving coil galvanometer has a coil of resistance 59 Ω. It shows a full-scale deflection for a current of 50 mA. How will you convert it to an ammeter having a range of 0 to 3A?
A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?
A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?
When a galvanometer is shunted with a 4 Ω resistance, the deflection is reduced to one-fifth. If the galvanometer is further shunted with a 2 Ω wire. The further reduction (find the ratio of decrease in current to the previous current) in the deflection will be (the main current remains the same)
Explain in brief the basic construction of a moving-coil table galvanometer whit a neat labelled diagram.
A galvanometer of resistance 100 Ω gives a full-scale deflection for a potential difference of 200 mV.
- What must be the resistance connected to convert the galvanometer into an ammeter of the range 0-200 mA?
- Determine resistance of the ammeter.
