Which of the following has a negative temperature coefficient
  • A$C$
  • B$Fe$
  • C$Mn$
  • D$Ag$
Easy
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.*

Similar Questions

  • 1
    Equivalent resistance between the points $A$ and $B$ is (in $\Omega$)
    View Solution
  • 2
    A current of $2\,A$ flows through a $2\,\Omega$ resistor when connected across a battery. The same battery supplies a current of $0.5\,\, A$ when connected across a $9 \,\,\Omega$ resistor. The internal resistance of the battery is 
    View Solution
  • 3
    The effective resistance between points $P$ and $Q$ of the electrical circuit shown in the figure is
    View Solution
  • 4
    A student is provided with a variable voltage source $V$, a test resistor $R_T=10\,\Omega$, two identical galvanometers $G_1$ and $G_2$ and two additional resistors, $R _1=10\,M\,\Omega$ and $R _2=0.001\,\Omega$. For conducting an experiment to verify ohms law, the most suitable circuit is:
    View Solution
  • 5
    There is a current of $20$ amperes in a copper wire of ${10^{ - 6}}$ square meter area of cross-section. If the number of free electrons per cubic meter is ${10^{29}}$, then the drift velocity is
    View Solution
  • 6
    Four resistances $40 \ \Omega, 60\  \Omega, 90\  \Omega$ and $110\  \Omega$ make the arms of a quadrilateral $A,B,C,D$. Across $AC$ is a battery of emf $40\, V$ and internal resistance negligible. The potential difference across $BD$ is $V$ is...... 
    View Solution
  • 7
    A meter bridge setup is shown in the figure. It is used to determine an unknown resistance $R$ using a given resistor of $15\,\Omega$. The galvanometer $(G)$ shows null deflection when tapping key is at $43\,cm$ mark from end $A$. If the end correction for end $A$ is $2\,cm$. then the determined value of $R$ will be__________ $\Omega$
    View Solution
  • 8
    Assertion : In a simple battery circuit, the point of the lowest potential is negative terminal of the battery.

    Reason : The current flows towards the point of the higher potential, as it does in such a circuit from the negative to the positive terminal.

    View Solution
  • 9
    A $10\, m$ long wire of $20\,\Omega$ resistance is connected with a battery of $3\, volt$ $e.m.f.$ (negligible internal resistance) and a $10 \,\Omega$ resistance is joined to it is series. Potential gradient along wire in volt per meter is
    View Solution
  • 10
    $n$ equal resistors are first connected in series and then connected in parallel. What is the ratio of the maximum to the minimum resistance
    View Solution