Question

The resistance of an ammeter is 13 Ω and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is ______. 

विकल्प

• 2 Ω

• 0.2 Ω

• 2 kΩ

• 20 Ω

Answer 1

The resistance of an ammeter is 13 Ω and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is 2 Ω.

Explanation:

We know

`"I"/"I"_"S"=1+"G"/"S"` 

`750/100=1+13/"S"`

S ⇒ 2 Ω