As shown in figure a variable rheostat of 2 k Ω Ω is used to control the potential difference across 500 ohm load.
(i) If the resistance AB is 500 Ω Ω , what is the potential difference across the load?
(ii) If the load is removed, what should be the resistance at BC to get 40 volt between B and C?
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
[(i) 
= 21.43 V, (ii) 1600 Ω Ω ]
Sol. (i)
As V 
R
V 2 = V BC = 
V = 
50
= 
50 = 
= 21.43 V
(ii) V BC = 40 V
⇒ V BC = 
V
⇒ 40 = 
50
⇒ R BC = 1600 Ω Ω
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