Materials which allow the passage of electric current are known as______
A wire of length 2m and another wire of length 5m are made up of the same material and have the same area of cross section, which wire has higher resistance?
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A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?
Which of the following statements are true with regard to resistance?
A wire has the same resistance as the one given in the figure. Calculate its resistivity if the length of the wire is 10m and its area of cross section is 2m.
Which, among the following is a unit for resistivity?
What is the resistivity of Copper?
Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m2 and 5m2 respectively.
Which of the following statements are true with regard to resistivity?
The reciprocal of resistivity is________
The resistance of pure metals ___________
The resistance of insulators __________
Which of the following statements are true about metals?
Which of the following statements are true about insulators?
What is the unit of temperature coefficient?
A copper coil has a resistance of 200 ohm when its mean temperature is 0 degree centigrade. Calculate the resistance of the coil when its mean temperature is 80 degree centigrade.
The temperature of a coil cannot be measured by which of the following methods?
The rise or fall in resistance with the rise in temperature depends on________
If the temperature is increased in semi-conductors such that the resistance incessantly falls, it is termed as_______
Materials having resistance almost equal to zero is_______