Question

31st.one

​Q31. Using the following measuring instruments, the best pair made for carrying out experiment to determine resistance of a resistor of nearly 30 $\mathrm{\Omega }$ is :

Milliammeter (A_r ) : Range 0 - 100 mA, Least count 20 mA.

Milliammeter (A₂) : Range 0-500 mA, Least count 5 mA.

Voltmeter (V₁) : Range 0- 3 V and Least count 0.05 V.

Voltmeter (V₂) : Range 0 - 2 V, and Least count 0.04 V.


(a) A₁ and V₁ (b) A₁ and V₂ (c) A₂ and V₂ (d) A₂ and V₁

Answer 1

$$\begin{gathered} Dearstudent, \\ thecombinationof{A}_{1}and{V}_{1}willbethebestchoice. \\ As,whenwecombinethesetwothemaximumvalueofresis\tan cewhichcanbecalculatedwillbe, \\ {R}_{max}=\frac{3}{100\times {10}^{-3}}=30ohm \\ whichisequaltotheresis\tan ceneedtobecalculated. \\ othercombinationwillhavemaximumvalueofresis\tan celessthan30ohm. \\ Regards \end{gathered}$$