A current of $10 \,A$ is maintained in a conductor of cross-section $1 \,cm ^2$. If the number density of free electrons be $9 \times 10^{28} \,m ^{-3}$, the drift velocity of free electrons is .......... $m / s$
Easy
Download our app for free and get started
(a)
$i=n e A V_d$
$10=\left(9 \times 10^{28}\right)\left(1.6 \times 10^{-19}\right)\left(10^{-4}\right) V_D$
Solving, we get
$V_D=6.94 \times 10^{-6} \,m / s$
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
- 1When a current of $2\, A$ flows in a battery from negative to positive terminal, the potential difference across it is $12\, V$. If a current of $3\, A$ flows in the opposite direction potential difference across the terminals of the battery is $15\, V$, the $emf$ of the battery is ............... $\mathrm{V}$View Solution
- 2A potentiometer wire has length $4\,\, m$ and resistance $8\,\,\Omega $. The resistance that must be connected in series with the wire and an accumulator of e.m.f. $2\,\, V,$ so as to get a potential gradient $1\,\, m \,V$ per $cm$ on the wire is ............. $\Omega$View Solution
- 3Potential difference $V_B-V_A$ in the network shown is ............. $V$View Solution
- 4$A \,6 \,V$ battery of negligible internal resistance is connected across a uniform wire of length $1\, m$. The positive terminal of another battery of emf $4\,V$ and internal resistance $1\, \Omega$ is joined to the point $A$ as shown in figure. The ammeter shows zero deflection when the jockey touches the wire at the point $C$. The $AC$ is equal toView Solution
- 5The potential difference between $A$ and $B$ in the Figure is ................. $V$View Solution
- 6The effective resistance between points $P$ and $Q$ of the electrical circuit shown in the figure isView Solution
- 7Drift velocity ${v_d}$ varies with the intensity of electric field as per the relationView Solution
- 8The terminal potential difference of a cell when short-circuited is ($E$ = $E.M.F.$ of the cell)View Solution
- 9Power dissipated across the $8 \,\,\Omega$ resistor in the circuit shown here is $2\,\, watt.$ The power dissipated in watt units across the $3 \,\,\Omega$ resistor isView Solution
- 10How much energy in kilowatt hour is consumed in operating ten $50\, watt$ bulbs for $10$ hours per day in a month ($30$ days).View Solution