In the given potentiometer circuit arrangement, the balancing length {AC} is measured to be 250 {cm}. When the galvanometer connection is shifted from point (1)

Q: In the given potentiometer circuit arrangement, the balancing length ${AC}$ is measured to be $250$ ${cm}$. When the galvanometer connection is shifted from point $(1)$ to point $(2)$ in the given diagram, the balancing length becomes $400\, {cm}$. The ratio of the emf of two cells, $\frac{\varepsilon_{1}}{\varepsilon_{2}}$ is -

c $E_{1}=k l_{1} \ldots .$ (i) $E_{1}+E_{2}=k l_{2} \ldots$ (ii) $\frac{E_{1}}{E_{1}+E_{2}}=\frac{l_{1}}{l_{2}}=\frac{250}{400}=\frac{5}{8}$ $8 E_{1}=5 E_{1}+5 E_{2}$ $3 E_{1}=5 E_{2}$ $\frac{E_{1}}{E_{2}}=\frac{5}{3}$

SECTION - A [PHYSICS - MCQ]

GSEB - English Medium

In the given potentiometer circuit arrangement, the balancing length ${AC}$ is measured to be $250$ ${cm}$. When the galvanometer connection is shifted from point $(1)$ to point $(2)$ in the given diagram, the balancing length becomes $400\, {cm}$. The ratio of the emf of two cells, $\frac{\varepsilon_{1}}{\varepsilon_{2}}$ is -

A$\frac{4}{3}$
B$\frac{3}{2}$
C$\frac{5}{3}$
D$\frac{8}{5}$

JEE MAIN 2021, Diffcult

STD 11 Science
NEET
STD 12 - 3. current electricity
Physics

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*

Download App

Similar Questions

1
In the given figure each plate of capacitance $C$ has partial value of charge
View Solution
2
An electric wire is connected across a cell of $e.m.f.$ The current $I$ is measured by an ammeter of resistance $R$. According to ohm's law
View Solution
3
In the circuit shown : $E_1 = 4.0\ V, R_1 = 2 \ \Omega,$$ E_2 = 6.0\ V, R_2 = 4\ \Omega$ and $R_3 = 2\ \Omega.$ The current $I_1$ is : ................ $A$
View Solution
4
An electric wire of length ‘$I$’ and area of cross-section $a$ has a resistance $R\, ohms$. Another wire of the same material having same length and area of cross-section $4a$ has a resistance of
View Solution
5
Current $I$ is flowing through the two materials having electrical conductivities $\sigma_1$ and $\sigma_2$ respectively $(\sigma_1 > \sigma_2 )$ as shown in the figure. The total amount of charge at the junction of the materials is
View Solution
6
In the figure, the potentiometer wire $AB$ of length $L$ and resistance $9r$ is joined to the cell $D$ of $\mathrm{emf}$ $\varepsilon$ and internal resistance $r$. The cell $C’s$ $\mathrm{emf}$ is $\varepsilon /2$ and its internal resistance is $2r$. The galvanometer $G$ will show no deflection when the length $AJ$ is
View Solution
7
Current of $4.8\,A$ is flowing through a conductor. The number of electrons per second will be
View Solution
8
The supply voltage to room is $120\ V$. The resistance of the lead wires is $6\,\Omega$ . A $60\ W$ bulb is already switched on. What is the decrease of voltage across the bulb, when a $240\ W$ heater is switched on in parallel to the bulb? ............. $V$
View Solution
9
Two wires of the same material and equal length are joined in parallel combination. If one of them has half the thickness of the other and the thinner wire has a resistance of $8\, ohms$, the resistance of the combination is equal to
View Solution
10
Carbon resistor has resistance specified by three bands having colour red, yellow and black. If this resistor is cut into two pieces of equal length then the new colour code of each one will be (Neglect tolerance of $4^{th}$ band)
View Solution

Download our appand get started for free

Similar Questions

Download our app
and get started for free