In an experiment to determine the resistance of a galvanometer by half deflection method, the circuit shown is used. In one set of readings, if $R = 10\text{Ω}$ and $S = 4\text{Ω}$ , then the resistance of the galvanometer is

Question

In an experiment to determine the resistance of a galvanometer by half deflection method, the circuit shown is used. In one set of readings, if

R = 10\text{Ω}

and

S = 4\text{Ω}

, then the resistance of the galvanometer is

In an experiment to determine the resistance of a galvanometer by half deflection method, the circuit shown is used. In

In an experiment to determine the resistance of a galvanometer by half deflection method, the circuit shown is used. In

Quantrex Academy · Accepted Answer

Correct answer: A. (20)/(3) Ω

In 1st case,& I _ 1 = (E)/(R + G) In 2nd case, I _ 2 = (E)/(R + (SG)/(S + G)) for half deflection, I _ 2G = (1)/(2) I _ 1 (1)/(2)(E)/(R + G) = (E)/(R + (SG)/(S + G))(S)/(S + G) ⇒ G = (RS)/(R - S) G = (10 × 4)/(10 - 4) = (20)/(3)Ω

In an experiment to determine the resistance of a galvanometer by...

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