Moving Charges and Magnetism - Result Question 79

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

(a) putting in series a resistance of 15Ω

(b) putting in series a resistance of 240Ω

(c) putting in parallel a resistance of 15Ω

(d) putting in parallel a resistance of 240Ω

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Answer:

Correct Answer: 81. (c)

Solution:

  1. (c) G=60Ω,Ig=1.0A,I=5A.

Let S be the shunt resistance connected in parallel to galvanometer IgG=(IIg)S,

S=IgGIIg=151×60=15Ω

Thus by putting 15Ω in parallel, the galvanometer can be converted into an ammeter.



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