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प्रश्न
How is current sensitivity increased?
Briefly describe how the current sensitivity of a moving coil galvanometer can be increased.
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उत्तर
A moving coil galvanometer's sensitivity can be enhanced by increasing the number of turns in the coil, the area of the coil, and the magnetic field, while decreasing the couple per unit twist of the suspension.
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संबंधित प्रश्न
A circular coil of 250 turns and diameter 18 cm carries a current of 12A. What is the magnitude of magnetic moment associated with the coil?
- A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60° with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.
- Would your answer change, if the circular coil in (a) were replaced by a planar coil of some irregular shape that encloses the same area? (All other particulars are also unaltered.)
Explain how moving coil galvanometer is converted into a voltmeter. Derive the necessary formula.
Why does a galvanometer when connected in series with a capacitor show a momentary deflection, when it is being charged or discharged?
How does this observation lead to modifying the Ampere's circuital law?
Hence write the generalised expression of Ampere's law.
Explain, giving reasons, the basic difference in converting a galvanometer into (i) a voltmeter and (ii) an ammeter?
In the meter bridge experiment, balance point was observed at J with AJ = l.
(i) The values of R and X were doubled and then interchanged. What would be the new position of balance point?
(ii) If the galvanometer and battery are interchanged at the balance position, how will the alance point get affected?
The coil of a moving coil galvanometer is wound over a metal frame in order to ______.
A galvanometer of resistance 100 Ω gives a full-scale deflection for a current of 10−5 A. To convert it into an ammeter capable of measuring up to 1 A we should connect a resistance of ______.
The figure below shows a circuit containing an ammeter A, a galvanometer G and a plug key K. When the key is closed:
