The e.m.f. of a cell of negligible internal resistance is 2 V. It is connected to the series combination of 2 Ω, 3 Ω and 5 Ω resistances. The potential difference across 3 Ω resistance will be
(A) 0.6 V
(B) 10 V
(C) 3 V
(D) 6 V
1 Answers
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The internal resistance of a cell of emf 2 V is 0.1 Ω, it is connected to a resistance of 0.9 Ω. The voltage across the cell will be
Correct answer is (B) 1.8 V
2 Answers 3 views
Three resistors of values 2 Ω, 4 Ω, 6 Ω are connected in series. The equivalent resistance of combination of resistors is …………………….
Correct option is D) 12 Ω
2 Answers 1 views
Three resistors of resistances R1 , R2 and R3 are joined in parallel. Derive an expression for equivalent resistance for this parallel combination.
rausch’s law states that the equivalent conductivity of an electrolyte at infinite dilution is equal to the sum of the conductances of the anions and cations. The molar conductivity of a solution...
2 Answers 1 views
A voltmeter is connected across a battery of emf 12 V and internal resistance of 10 Ω. If the voltmeter resistance is 230 Ω, what reading
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...
2 Answers 1 views
If n identical cells, each of emf E and internal resistance r, are connected in series, write an expression for the terminal p.d.
i. Let n identical cells, each of emf E and internal resistance r, be connected in series. Let the current supplied by this combination to an external resistance R be...
2 Answers 1 views
A cell of emf E and internal resistance r is connected across an external resistance R (R >> r). The p.d. across R is
Correct option is: (B) E(I – \(\frac{r}{R}\))
2 Answers 1 views
Emf of a cell is 2.2 volt. When resistance R = 5 Ω is connected in series, potential drop across the cell becomes 1.8 volt.
Correct option is: (A) 10/9 Ω
2 Answers 1 views
The internal resistance of a cell of emf 2 V is 0.1 Ω. It is connected to a resistance of 3.9 Ω. The voltage across the cell will be
Correct option is: (C) 1.95 V
2 Answers 1 views
In a series combination of cells, the effective internal resistance will
Correct option is: (C) increase.
2 Answers 2 views
The emf of a cell is `Ev`, and its its internal resistance is `1Omega`. A resistance of `4Omega` is joined to battery in parallel. This is connected i
Correct Answer - C `r=R[(l_(1)-l_(2))/(l_(2))]`
2 Answers 1 views