Physics

Problem

Resistance value of an unknown resistor is calculated using the formula

R = V/I

where

V

and

I

be the readings of the voltmeter and the ammeter respectively. Consider the circuits below. The internal resistances of the voltmeter and the ammeter (

R_V

and

R_G

respectively) are finite and non zero. Let

R_A

and

R_B

be the calculated values in the two cases

A

and

B

respectively. The relation between

R_B

and the actual value

R

is ![](https://storage.googleapis.com/diraq-contents/PROD/homework-question-parsing/marker/138db74abb484c569646d0f63c8fc3b9/e23c9577e177bf077bac8951a775dd90_img.jpg) ![](https://storage.googleapis.com/diraq-contents/PROD/homework-question-parsing/marker/93a6c58f7782466fa8335ebd386b3c51/cfbf0f2ddbc35370b0b8c6d043f25eb2_img.jpg) (a)

R < R_B

(b)

R > R_B

(c)

R = R_B

(d) dependent upon

E

and

r

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