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A microammeter has as resistance of 100 ...

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 and `10 kOmega` resistance in series

B

10 V range and `200 k Omega` resistance in series

C

5 m A range with ` 1 Omega` resistance in parallel

D

both 'b' and 'c'

Text Solution

Verified by Experts

The correct Answer is:
D
(i) `R=(V)/(I_g)-G=(10)/(50xx10^-6)-100approx 200kOmega`
For converting galvanometer into voltmeter a high resistance is joined in series with the galvanometer.
(ii) `S=((I_g)/(I-I_g))G=((50xx10^-6)/(50xx10^-3-50xx10^-6))100approx1Omega` For converting galvanometer into ammeter a low resistance is joined in parallel with the galvanometer.
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