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Question
A potentiometer wire of length 100 cm and resistance 3 `Omega` is connected in series with resistance of 8 `Omega` and an accumulator of 4 volt whose internal resistance is 1 `Omega`.
Options
0.25 volt
1.00 volt
0.50 volt
0. 75 volt
MCQ
Solution
0.50 volt
Explanation:
Total resistance = 3 + 8 + 1 = 12 `Omega`
current `"I" = "E"/"R" = 4/12 = 1/3 "A"`
`"P .D. across the wire" = "IR"_omega = 1/3 xx 3 = 1 "V"`
`"potential gradient K" = "V"/"L" = 1/1 = 1"v"//"m"`
`"E'" = "K"varphi'`
`= 1 xx 0.5 = 0.5 "V"`
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Potentiometer
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