A potentiometer circuit shown in the figure is set up to measure $e.m.f.$ of a cell $E$. As the point $P$ moves from $X$ to $Y$ the galvanometer $G$ shows deflection always in one direction, but the deflection decreases continuously until $Y$ is reached. In order to obtain balance point between $X$ and $Y$ it is necessary to
Easy
Download our app for free and get started
(a) Decreasing $R$ increases current in $XY$ and there by increases the potential drop across $XP$ and the balance point may be obtained. The current may be increased also by increasing $V.$
Download our appand 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.*
Similar Questions
- 1A torch battery consisting of two cells of $1.45\, volts$ and an internal resistance $0.15\,\Omega $, each cell sending currents through the filament of the lamps having resistance $1.5\,ohms$. The value of current will be ....... $A$View Solution
- 2In an electric heater $4\, amp$ current passes for $1$ minute at potential difference of $250\, volt$, the power of heater and energy consumed will be respectivelyView Solution
- 3If the rheostat slider were to move from the extreme right to the far left, How will the reading of voltmeter $V_1$ change?View Solution
- 4A current of $10\, amp$ is passing through a metallic wire of cross sectional area $4 \times 10^{-6}\, m ^{2}$. If the density of the aluminum conductor is $2.7\, gm / cc$ considering aluminum gives $1$ electrons per atom for conduction find the drift speed of the electrons is ......... $\times 10^{-4} \,m / s$ if molecular weight of aluminum is $27 \,gm$.View Solution
- 5Current density in a cylindrical wire of radius $R$ is given as $J =$ $\left\{ {\begin{array}{*{20}{c}}View Solution
{{J_0}\left( {\frac{x}{R} - 1} \right)\,\,for\,\,0 \leqslant x < \frac{R}{2}} \\
{{J_0}\frac{x}{R}\,\,\,\,for\,\,\,\frac{R}{2} \leqslant x \leqslant R}
\end{array}} \right.$The current flowing in the wire is: - 6If a copper wire is stretched to increase its length by $20 \% $. The percentage increase in resistance of the wire is $..........\%$View Solution
- 7Find current in $6\,\Omega $ resistanceView Solution
- 8Which of the following wiring diagrams could be used to experimentally determine $R$ using ohm's law? Assume an ideal voltmeter and an ideal ammeter.View Solution
- 9The charge supplied by source varies with time $'t'$ as $Q = at -bt^2$. The total heat produced in the resistor $2R$ before current reduces to zeroView Solution
- 10Resistance in the two gaps of a meter bridge are $10\, ohm$ and $30\, ohm$ respectively. If the resistances are interchanged the balance point shifts by.............. $cm$View Solution