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Question
Why is it necessary to introduce a radial magnetic field inside the coil of a galvanometer?
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Solution
A radial magnetic field is necessary so that plane of the coil in all positions remain parallel to the direction of magnetic field
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RELATED QUESTIONS
Increasing the current sensitivity of a galvanometer may not necessarily increase its voltage sensitivity. Explain, giving reason.
Can a galvanometer as such be used for measuring the current? Explain.
Define current sensitivity of a galvanometer.
Explain the significance of a radial magnetic field when a current-carrying coil is kept in it.
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 voltmeter of variable ranges 3 V, 15 V, 150 V is to be designed by connecting resistances R1, R2, R3 in series with a galvanometer of resistance G = 20 Ω, as shown in Fig. The galvanometer gives full pass through its coil for 1 mA current i.e. "gives full pass through it's coil for 1 mA current". Then, the resistances R1, R2 and R3 (in kilo ohms) should be, respectively:
How is current sensitivity increased?
The unit of voltage sensitivity of a galvanometer is:
The poles of the permanent magnet used in a moving coil galvanometer are shaped as:
The non-magnetic frame of a moving coil galvanometer is made of aluminium, and its function is to provide:
