Question

A microammeter has as resistance of `100 Omega` and full scale range of `50 muA`. It can be used a voltmeter or as ahigher range ammeter provided a resistance is added to it. Pick the correct range and resistance combinations
50 V range with `10 kOmega` resistance in series
b.`10 V` range with `200 kOmega` resistance in series
c. 5mA rangw with `1Omega` resistance in parallel
`10 mA` range with `1Omega` resistance in parallel
A. `50 V` range with `10 k Omega` resistance in series.
B. `10 V` range with `200 k Omega` resistance in series.
C. `5 mA` range with `1 Omega` resistance in parallel.
D. `10 mA` range with `1 kOmega` resistance in parallel.

Answer 1

Correct Answer - B::C
`(B) R=V/(I_(g))-G=10/(50xx10^(-6))-100=2xx10^(5)`
`Omega=200 K Omega`
`(C)S=G/((I/(I_(g))-1))=(100Omega)/(((5xx10^(-3))/(50xx10^(6))-1))=1 Omega`