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what is voltage sensitivity of galvanometer?

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Q. Assertion :Increasing the current sensitivity of a galvanometer necessarily increases the voltage sensitivity. Reason: Voltage sensitivity is inversely proportional to current sensitivity.

Q. The relation between voltage sensitivity

(σ_{v})

and current sensitivity

(σ_{i})

of a moving coil galvanometer is (resistance of galvanometer is

G

Q. Explain, using a labelled diagram, the principle and working of a moving coil galvanometer. What is the function of (i) uniform radial magnetic field, (ii) soft iron core?
Define the terms (i) current sensitivity and (ii) voltage sensitivity of a galvanometer. Why does increasing the current sensitivity not necessarily increase voltage sensitivity?

Q. Current sensitivity of a moving coil galvanometer is

5

div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is

20

div/V. The resistance of the galvanometer is?

Q. If the current sensitivity of a galvanometer is doubled, then its voltage sensitivity will be

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