The emf of a cell is 12 V. When it sends a current of 1 A through an external resistance, the p.d. across the terminals reduces to 10 V.
The internal resistance of the cell is
(A) 0.1 Ω
(B) 0.5 Ω
(C) 1 Ω
(D) 2 Ω
Answered Feb 05, 2023
Correct option is: (D) 2 Ω
Correct answer is (B) 1.8 V
Correct answer is (A) 2
Answer A) 3 ohm Soln-: 2/x=y/(100-x) 200-2x=xy ......1 After interchanging Y/x+20 = 2/(80-x) 80y-xy=2x+40 .......2 On solving equation 1 and 2 Y=3 ohm
Given: E = 12 volt, r = 10 Ω, R = 230 Ω To find: Reading shown by voltmeter (V) Formula: i. I = \(\frac{E}{R+r}\) ii. V = E – Ir Calculation: From formula (i), I = \(\frac{12}{230+10}=\frac{12}{240}=\frac{1}{20}\) A From...
Correct option is: (B) E(I – \(\frac{r}{R}\))
Correct option is: (A) 10/9 Ω
Correct option is: (D) 3 Ω
Correct option is: (C) 1.95 V
Correct Answer - C `r=R[(l_(1)-l_(2))/(l_(2))]`
Correct Answer - B `r=((E-V)/(V))R`
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