Download App
A wire $50\, cm$  long and $1\;mm^2$ in cross -section carries a current of $4\; A$ when connected to a $2\; V$ battery. The resistivity of the wire is
  • A$1 \times  {10^{ - 6}}\;\Omega-m$
  • B$4 \times  {10^{ - 6}}\;\Omega-m$
  • C$5\times  {10^{ - 7}}\;\Omega-m$
  • D$2 \times  {10^{ - 7}}\;\Omega-m$
AIPMT 1994, Medium
art

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
    Two wires '$A$' and '$B$' of the same material have their lengths in the ratio $1 : 2$ and radii in the ratio $2 : 1$. The two wires are connected in parallel across a battery. The ratio of the heat produced in '$A$' to the heat produced in '$B$' for the same time is
    View Solution
  • 2
    Water boils in an electric kettle in $20$ minutes after being switched on. Using the same main supply, the length of the heating element should be. . . . . . .to . . . . . .. times of its initial length if the water is to be boiled in $15$ minutes.
    View Solution
  • 3
    Conductivity increases in the order of
    View Solution
  • 4
    A potentiometer wire has length $10\, m$ and resistance $20\,\Omega $. A $2. 5\, V$ battery of negligible internal resistance is connected across the wire with an $80\,\Omega $ series resistance. The potential gradient on the wire will be
    View Solution
  • 5
    For the network shown below, the value $V _{ B }- V _{ A }$ is_______ $V$
    View Solution
  • 6
    A battery of $e.m.f.$ $10\, V$ and internal resistance $0.5\, ohm$ is connected across a variable resistance $R$. The value of $R$ for which the power delivered in it is maximum is given by ......... $ohm$
    View Solution
  • 7
    Two wires $A$ and $B$ of the same material, having radii in the ratio $1: 2$ carry currents in the ratio $4: 1$. The ratio of drift speed of electrons in $A$ and $B$ is
    View Solution
  • 8
    In the circuit shown, current (in $A$) through $50\; V$ and $30\; V$ batteries are, respectively
    View Solution
  • 9
    Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor $R$ is ............. $\Omega$
    View Solution
  • 10
    The internal resistance of a cell is the resistance of
    View Solution