Questions
Resistance of 100 cm long potentiometer wire is . It is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is
detailed solution
Correct option is B
E = eR+Rh+r RL× l 10 × 10−3= 210+R+0 × 101× 0.4⇒R=790 ΩTalk to our academic expert!
Similar Questions
A cell of resistance and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm. The potential gradient in the wire is
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