Advertisements
Advertisements
प्रश्न
Write the formula of resistivity
Advertisements
उत्तर
Resistance R of a conductor depends on the length ‘l’ and area of cross section ‘A’ of the conductor
`R alpha l`
and `R alpha l/A`
`:. R alpha l/A`
`:. R = rho 1/A` ...(ρ is constant)
where ρ is called resistivity of the conductor.
APPEARS IN
संबंधित प्रश्न
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Write the SI unit of resistivity
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.
Which law is illustrated by such a graph?
How should the two resistances of 2 ohms each be connected so as to produce an equivalent resistance of 1 ohm?
The resistors R1, R2, R3 and R4 in the figure given below are all equal in value.
What would you expect the voltmeter A, B and C to read assuming that the connecting wires in the circuit have negligible resistance?
Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 V.
A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?
How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
Fig. represents the circuit used for the verification of ohm's law. Label the different parts from A and F. State the function of each.
Define ampere and volt with respect to Ohm’s law.
State the limitations of Ohm’s law.
What are non-ohmic conductors? Give one exmaple. Draw a current-voltage graph for a non-ohmic conductor.
The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.
Which of the following I-V graph represents ohmic conductors?
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?
A heater of 220 V heats a volume of water m 5 mint time. A heater of 110 V heat in ten second. The resistance of the conductor is
State Ohm's Law. Represent it mathematically.
