Current Electricity and Electrical InstrumentHard
Question
A piece of copper is to be shaped so as to have a minimum resistance. Its length and cross-sectional area should be :-
Options
A.L and A
B.2L and A/2
C.L/2 and 2A
D.Do not matter, since volume remains same.
Topic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
R = ⇒ R ∝ L2The equivalent resistance between the points A and B is -...A microammeter has a resistance of 100Ω and full scale reange of μ A. It can be used as voltmeter or as higher...In a meter bridge set up, which of the following should be the properties of the one long wire ?...A cell of emf E having an internal resistance r is connected to an external resistance R. The potential difference V acr...In an LCR circuit as shown below both switches are open initially. Now switch S1 is closed, S2 kept open, (q is charge o...