Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more ? Justify your answer.
(i) Nichrome
(ii) > , (or > )
Justification : Conduction of electrons
Two wires having similar length and radius, Nichrome wire gets heated up more as compared to copper wire since resistivity of Nichrome is more than that of Copper.
(ii) > , (or > )
Justification : Conduction of electrons
Two wires having similar length and radius, Nichrome wire gets heated up more as compared to copper wire since resistivity of Nichrome is more than that of Copper.
Plot a graph showing the variation of current I versus resistance R, connected to a cell of emf E and internal resistance r.
Draw a graph to show the variation of resistance of a metal wire as a function of its diameter keeping its length and material constant.
In the circuit shown in the figure, find the total resistance of the circuit and the current in the arm CD.
How does the random motion of free electrons in a conductor get affected when a potential difference is applied across its ends ?
How does one explain increase in resistivity of a metal with increase in temperature ?
Give an example of a material each for which temperature coefficient of resistivity is:
(i) positive, (ii) negative.
The emf of a cell is always greater than its terminal voltage. Why ? Give reason.
A capacitor of 4 μF is connected as shown in the circuit Figure. The internal resistance of the battery is 0.5 Ω. The amount of charge on the capacitor plates will be :
Give an example of a material each for which temperature coefficient of resistivity is:
(i) positive, (ii) negative.
When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction ?
What is the geometrical shape of equipotential surfaces due to an isolated charge ?
Does the charge given to a metallic sphere depend on whether it is hollow or solid?