Carbon resistor has resistance specified by three bands having colours red, yellow and black. If the resistor is remolded to make a resistor twice of previous length, the new colour code will be
  • A
    White, Blue, Black
  • B
    Red, Orange, Black
  • C
    Brown, Red, Black
  • D
    Yellow, Gray, Black
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.*

Similar Questions

  • 1
    A wire of circular cross section has inner portion of radius $R$ made of material of resisitivity $\rho$ and is surrounded by an outer portion of thickness $R$ made of a material of double resisitivity. Find the resistance of length $l$ of such wire
    View Solution
  • 2
    In given circuit find potential difference between $P$ and $Q$ .................. $V$
    View Solution
  • 3
    $A$. The drift velocity of electrons decreases with the increase in the temperature of conductor.

    $B$. The drift velocity is inversely proportional to the area of cross-section of given conductor.

    $C$. The drift velocity does not depend on the applied potential difference to the conductor.

    $D$. The drift velocity of electron is inversely proportional to the length of the conductor.

    $E$. The drift velocity increases with the increase in the temperature of conductor.

    Choose the correct answer from the options given below:

    View Solution
  • 4
    An electric lamp is marked $60\, W$, $230\, V$. The cost of a $1\, kWh$ of energy is Rs. $1.25$. The cost of using this lamp $8$ hrs a day for $30$ day is Rs. ...............
    View Solution
  • 5
    Masses of three wires of copper are in the ratio of $1 : 3 : 5$ and their lengths are in the ratio of $5:3:1.$ The ratio of their electrical resistances are
    View Solution
  • 6
    The resistance per centimeter of a meter bridge wire is $\mathrm{r}$, with $\mathrm{X}\  \Omega$ resistance in left gap. Balancing length from left end is at $40 \mathrm{~cm}$ with $25\  \Omega$ resistance in right gap. Now the wire is replaced by another wire of $2 \mathrm{r}$ resistance per centimeter. The new balancing length for same settings will be at
    View Solution
  • 7
     A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of $2.0\,V$ and a negligible internal resistance. The potentiometer wire itself is $4\,m$ long. When the resistance $R,$ connected across the given cell, has values of  $(i)$ infinity $(ii)$ $9.5\,\Omega$ the balancing lengths on the potentiometer wire are found to be $3\,m$ and $2.85\,m,$ respectively. The value of internal resistance of the cell is ............... $\Omega$
    View Solution
  • 8
    The current from the battery in the given circuit is ................ $A$
    View Solution
  • 9
    A wire of resistance $20 \Omega$ is divided into $10$ equal parts. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent resistance of final combination is_______.0$\Omega$.
    View Solution
  • 10
    The specific resistance of a wire is $\rho $, its volume is $3\,{m^3}$ and its resistance is $3\, ohms$, then its length will be
    View Solution