A microammeter has a resistance of 100 Ω and full scale range of 50 μ A. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination-

Question

A microammeter has a resistance of 100 Ω and full scale range of 50 μ A. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination- (A) 50 V range with 10 k Ω resistance in series (B) 10 V range with 200 k Ω resistance in series (C) 10 m A range with 1 k Ω resistance in parallel (D) 10 mA range with 0.1 k Ω resistance in parallel

Tardigrade Admin · Accepted Answer

ig=i((S G/S+G)) or 50 × 10-6=i((S/S+100))....(i) Also V=ig(G+R0) or V=50 × 10-6(100+R0) ....(ii) On simplifying above equations, we get V=10 V, R0=200 × 10-3 Ω

Q. A microammeter has a resistance of $100 Ω$ and full scale range of $50 μ A$ . It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination-

$50 V$ range with $10 k Ω$ resistance in series

$10 V$ range with $200 k Ω$ resistance in series

$10 m A$ range with $1 k Ω$ resistance in parallel

$10 m A$ range with $0.1 k Ω$ resistance in parallel

$i_{g} = i (\frac{SG}{S + G})$
or $50 \times 1 0^{- 6} = i (\frac{S}{S + 100})$ ....(i)
Also $V = i_{g} (G + R_{0})$
or $V = 50 \times 1 0^{- 6} (100 + R_{0})$ ....(ii)
On simplifying above equations, we get
$V = 10 V, R_{0} = 200 \times 1 0^{- 3} Ω$

Q. A microammeter has a resistance of 100Ω and full scale range of 50μA. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination-

50V range with 10kΩ resistance in series

10V range with 200kΩ resistance in series

10mA range with 1kΩ resistance in parallel

10mA range with 0.1kΩ resistance in parallel