Emf (E)=2V
Resistance of Potentiometer wire (R)=3Ω
Potential Difference (V)=1.5mV=1.5∗10−3V
Let, R′ be the resistance to be connected in series.
∴ Total resistance of the circuit (RT)=R′+3
Here, current across the potentiometer circuit (I)=ERT=2R′+3
Also, we have, p.d. across potentiometer wire =IR
or, 1.5∗10−3=2R′+3∗3
or, R′+3=4000
∴ R′=3997Ω
Hence resistance needed in series =3997Ω
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