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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Experimental Physics

NTA Abhyas 2020 · Physics · Experimental Physics

A galvanometer coil has a resistance 90Ω and full-scale deflection...

A galvanometer coil has a resistance 90Ω90Ω and full-scale deflection current 10mA10mA. A 910Ω910Ω resistance is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is 0.1V0 . 1V, the number of divisions on its scale isA galvanometer coil has a resistance 90Ω and full-scale deflection current 10mA . A 910Ω resistance is connected in

Correct answer

100

Step-by-step solution

A galvanometer coil has a resistance 90Ω and full-scale deflection current 10mA . A 910Ω resistance is connected in

Vmax=(Imax)(Rg+Rs){\text{V}}_{\text{max}} = \left({\text{I}}_{\text{max}}\right) \left({\text{R}}_{\text{g}} + {\text{R}}_{\text{s}}\right)

=(10×10−3)(1000)= \left(1 0 \times 1 {0}^{- 3}\right) \left(1 0 0 0\right)

=10V= 1 0 \text{V}

L.C.=0.1 V\text{L.C.} = \text{0.1 V}

N(L.C.)=Vmax\text{N} \left(\text{L.C.}\right) = {\text{V}}_{\text{max}}

⇒N=100.1=100⇒ \text{N} = \dfrac{1 0}{\text{0.1}} = 1 0 0
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