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 resistors are connected in series across a battery as shown in figure. If a voltmeter of resistance $2000 \,\Omega$ is used to measure the potential difference across $500 \,\Omega$ resister, the reading of the voltmeter will be ............... $V$
    View Solution
  • 2
    As show in the figure, in steady state, the charge stored in the capacitor is....... $\times 10^{-6}\,C$.
    View Solution
  • 3
    The terminal voltage of the battery, whose emf is $10 \mathrm{~V}$ and internal resistance $1 \Omega$, when connected through an external resistance of $4 \Omega$ as shown in the figure is:
    View Solution
  • 4
    An electric kettle has two heating coils. When one coil is used, water in the kettle boils in $5$ minutes, while when second coil is used, same water boils in $10\,\min$. If the two coils, connected in parallel are used simultaneously, the same water will boil in time
    View Solution
  • 5
    The total momentum of electrons in a straight wire of copper of length $1\, metre$ carrying a current of $16\, A$ is
    View Solution
  • 6
    Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, $100 \mathrm{~W}, 60 \mathrm{~W}$ and $40 \mathrm{~W}$ bulbs have filament resistances $\mathrm{R}_{100}, \mathrm{R}_{60}$ and $\mathrm{R}_{40}$, respectively, the relation between these resistances is
    View Solution
  • 7
    If six identical cells each having an $e.m.f.$ of $6\,V$ are connected in parallel, the $e.m.f.$ of the combination is ................ $V$ 
    View Solution
  • 8
    In a potentiometer, the null point is received at $7^{th}$ wire. If now we have to change the null point at $9^{th}$ wire, what should we do ?
    View Solution
  • 9
    A Daniel cell is balanced on $125\,cm$ length of a potentiometer wire. Now the cell is short-circuited by a resistance $2\, ohm$ and the balance is obtained at $100\,cm$. The internal resistance of the Daniel cell is .............. $ohm$
    View Solution
  • 10
    In the following circuit, the magnitude of current $I _{ l }$, is $............A$.
    View Solution