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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.

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प्रश्न

Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.

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उत्तर

No, Ohm’s law is not universally applicable for all conducting elements. Vacuum diode semi-conductor is a non-ohmic conductor. Ohm’s law is not valid for it.

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पाठ 3: Current Electricity - Exercise [पृष्ठ १२९]

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एनसीईआरटी Physics Part I and II [English] Class 12
पाठ 3 Current Electricity
Exercise | Q 3.18 (b) | पृष्ठ १२९

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

Name the unit of electrical resistance and give its symbol.


The graph between V and I for a conductor is a straight line passing through the origin.

  1. Which law is illustrated by such a graph?
  2. What should remain constant in a statement of this law?

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?


Show by a diagram how two resistors R1 and R2 are joined in parallel. Obtain an expression for the total resistance of the combination. 


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.


Calculate the effective resistance across AB?


A metal sphere is kept on an insulting stands. A negatively charged rod is brought near it, then the sphere is  earthed as shown. On removing the earthing, and taking the negatively charged rod away, what will be the  nature of charge on the sphere? Give reason for your answer. 


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 the following:

Coulomb


  1. Name and state the law which relates the potential difference and current in a conductor.
  2. What is the necessary condition for a conductor to obey the law named above in part (a) ?

What are non-ohmic conductors? Give one exmaple. Draw a current-voltage graph for a non-ohmic conductor.


Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.


The unit of specific resistance is ____________.


Assertion: The statement of Ohm’s law is K = IR.

Reason: V = IR is the equation which defines resistance.


The heat produced by a 100 w heater in 2 minute is equal to


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.


You are provided with a resistor, a key, an ammeter, a voltmeter, four cells of 1.5 V each and few connecting wires. Using circuit components, draw a labelled circuit diagram to show the setup to study Ohm's law.

State the relationship between potential difference (V) across the resistor and the current (I) flowing through it. Also draw V-I graph, taking V on the X-axis.


A current of 0.8 A flows in a conductor of 40 Ω for 1 minute. The heat produced in the conductor will be ______.


The voltage - current readings of a certain material are shown in the table given below:

Voltage (V) 10 V 20 V 30 V
Current (I) 2 A 3 A 4 A

Study the table.

  1. State whether the conductor used is ohmic or non-ohmic.
  2. Justify your answer.
  3. State Ohm's law.

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