24for q2
i hope u use soap while bathing...so h20 +ions from soap will conduct electricity and will fry you up [3]
Ques1) Although the internal resistances of all sources of emf were neglected in the treatment of the potentiometer, it is really not necessary to make this assumption?
Explain why internal resistances play no role in the measurement of e.m.f of potentiometer.
Ques2) Why is it dangerous to turn on a light when you are in the
bathtub?
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5 Answers
24
1for the first one
measurement of EMF using a potentiometer is done when there is no current passing through the cell or battery
as no current is passing through them , internal resistance has no role to play
V=IR so potential difference across them is zero
3pure water doesnt conduct bcos it has no impurities like calcium and mg salts but water used for bath always contains calcium and mg salts which can conduct electricity so we will get fried up.