Current ElectricityElectrical Resistance (KVPY (Kishore Vaigyanik Protsahan Yojana) StreamSA (Class 11) Physics): Questions 1  2 of 2
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Question number: 1
» Current Electricity » Electrical Resistance
Write in Short
Consider the two circuits P and Q, shown below, which are used 20 measure the unknown resistance R.
In each case, the resistance is estimated by using Ohm’s law , Where V and I are the readings of the voltmeters and the ammeters respectively. The internal resistances of voltmeter and ammeter are R _{V} and R _{A}, such that R _{A} < < R < < R _{V}.
The internal resistance of the battery may be ignored. The absolute error in the estimate of the resistance is denoted by δ R = R  Rest .
(a) Express δ R _{P} in terms of the given resistance values
(b) Express δ R _{Q} in terms of the given resistance values
(c) For what value of R will δ R _{P } ≈ δ R _{Q}
Question number: 2
» Current Electricity » Electrical Resistance
Appeared in Year: 2011
Question
A cylindrical copper rod has length L and resistance R. If it is melted and formed into another rod of length 2L, than the resistance will be
Choices
Choice (4)  Response  

a.  8R 

b.  R 

c.  4R 

d.  2R 
