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प्रश्न
Write the SI unit of resistivity
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उत्तर
The SI unit of resistivity is ohm-meter (Ω - m)
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संबंधित प्रश्न
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.
Write the formula of resistivity
Name the law which is illustrated by the above V−I graph.
Ohm's law gives a relationship between:
(a) current and resistance
(b) resistance and potential difference
(c) potential difference and electric charge
(d) current and potential difference
The graph between V and I for a conductor is a straight line passing through the origin.
What should remain constant in a statement of this law?
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A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.
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A wire has a length of 2.0 m and a resistance of 5.0 Ω. Find the electric field existing inside the wire if it carries a current of 10 A.
Define the following:
Coulomb
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What is meant by the drift speed of free electrons?
Answer the following question.
Distinguish between Ohmic and non-ohmic substances; explain with the help of example.
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Explain the equivalent resistance of a series resistor network.
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is hue?
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?
Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter 2 mm and inner diameter 1 mm. Find the ratio of resistance RA to RB.
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Draw a labelled circuit diagram to verify this relationship.
