$I-V$ characteristic of a copper wire of length $L$ and area of cross-section $A$ is shown in figure. The slope of the curve becomes
Easy
Download our app for free and get started
(d) Slope of $V-i$ curve $ = R\,\left( { = \frac{{\rho l}}{A}} \right)$. But in given curve axis of $i$ and $V$ are interchanged. So slope of given curve $ = \frac{1}{R}\left( { = \frac{A}{{\rho l}}} \right)$ i.e. with the increase in length of the wire. Slope of the curve will decrease.
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 bulb rated at ($100\,W$ - $200\,V$) is used on a $100\,V$ line. The current in the bulb isView Solution
- 2Two wires of the same dimensions but resistivities ${\rho _1}$ and ${\rho _2}$ are connected in series. The equivalent resistivity of the combination isView Solution
- 3The value of current in the $6 \,\Omega$ resistance is $....\,A$View Solution
- 4In a meter bridge, the null point is found at a distance of $25\, cm$ from $A$ . If now a resistance of $10\,\Omega $ is connected in parallel with $S$, the null point occurs at mid point of $AB$. The value of $R$ is .............. $\Omega$View Solution
- 5As shown in the figure, a potentiometer wire of resistance $20\,\Omega$ and length $300\,cm$ is connected with resistance box (R.B.) and a standard cell of emf $4\,V$. For a resistance ' $R$ ' of resistance box introduced into the circuit, the null point for a cell of $20\,mV$ is found to be $60\,cm$. The value of ' $R$ ' is $.....\Omega$View Solution
- 6ln a balanced wheat stone bridge, current in the galvanometer is zero. It remains zero when:View Solution
$[1]$ battery emf is increased
$[2]$ all resistances are increased by $10\,ohms$
$[3]$ all resistances are made five times
$[4]$ the battery and the galvanometer are interchanged
- 7The figure shows a network of resistances in which the point $A$ is earthed. The current through the $4\,\Omega$ resistor isView Solution
- 8A meter bridge set up as shown to determine end correction at $A$ and $B$. When a resistance of $15\ \Omega$ is used in left gap and of $20\ \Omega$ in right gap, then null point comes at a distance $42\ cm$ from $A$. When these resistances are interchanged null point comes at a distance $57\ cm$ from $A$. Values of end corrections areView Solution
- 9Resistances are arranged in a cyclic order to form a balanced wheatstone bridge as shown in figure. Ratio of power consumed in the branches $P + Q$ and $R + S$ isView Solution
- 10An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in $6\,\min$ . When the other coil is switched on, the water boils in $3\,\min$. If the two coils are connected in series, the time taken to boil the water in the kettle is ............. $min$View Solution