A galvanometer of resistance 100Ω when connected in series with 400Ω measures a voltage of upto 10 V . The value of resistance required to convert the galvanometer into ammeter to read upto 10 A is x

Question

A galvanometer of resistance 100Ω when connected in series with 400Ω measures a voltage of upto 10 V . The value of resistance required to convert the galvanometer into ammeter to read upto 10 A is x × 1 0 − 2 Ω . The value of x is :

TestHub · Accepted Answer

i g ​ = 400 + 100 10 ​ = 20 × 1 0 − 3 A For ammeter Let shunt resistance = S ​ i g ​ R = ( i − i g ​ ) S 20 × 1 0 − 3 × 100 = 10 S S = 20 × 1 0 − 2 Ω ​ ​

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