Advertisements
Advertisements
प्रश्न
Give units of specific resistance.
State the unit in which specific resistance is measured.
Advertisements
उत्तर
The S.I. unit of specific resistance is ohm-metre or Ω m.
APPEARS IN
संबंधित प्रश्न
The substance having infinitely high electrical resistance is called:
(a) conductor
(b) resistor
(c) superconductor
(d) insulator
How does the presence of impurities in a metal affect its resistance?
What is the resistance between A and B in the figure given below?
Draw a V-I graph for a conductor at two different temperatures. What conclusion do you draw from your graph for the variation of resistance of conductor with temperature?
A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).

Six resistances are connected together as shown in the figure. Calculate the equivalent resistance between points A and B.

2Ω resistor A, 1Ω resistor B and 4Ω resistor C are connected in parallel. The combination is connected across a 2V battery of negligible resistance. Draw the diagram of the arrangement and calculate:
(i) The current in each resistor A and C,
(ii) The current through battery.
What should be the length of a nickel wire of area of cross-section 3 mm2 used for making a rheostat of 750 ohm? (ρ of nickle = 0.069 Ohm mm2/m)
