A galvanometer having a coil resistance of 60 shows full scale deflection when a current of 1.0 amp passes through it. It can be converted into an ammeter to read currents upto 5.0 amp by:

NEET 2009 Physics question

A galvanometer having a coil resistance of shows full scale deflection when a current of passes through it. It can be converted into an ammeter to read currents upto by:

(1)putting in series a resistance of
(2)putting in series a resistance of
(3)putting in parallel a resistance of Correct
(4)putting in parallel a resistance of

Answer: (3)

Solution

An ammeter is made from a galvanometer by connecting a low resistance (shunt) S in parallel with it. The galvanometer takes and the shunt must carry . The potential difference across both is the same: $ G = (I -

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Question ID VK-090158