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

Options

A. `(2.0 m, 14.25 m)`
B. `(2.25 m, 10 m)`
C. `(3.75 m, 9 m)`
D. `(1.75 m, 12 m)`

Answer

D

Explanation

By using `s = ut + (1)/(2)at^(2)` for individual partiles
For `1^(st)` particle : `s_(x) = (3) (1.5) + (1)/(2) (2) (1.5)^(2) = 2.25 m`
For `II^(nd)` particle `= s_(y) = (6) (3) + (1)/(2)(-2)(3)^(2) = 9m`
Therefore `X_(cm) = (2.25)/(3) + 1 = 1.75 m` and `y_(cm) = (2(9))/(3) + 6 = 12m`