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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? - Science

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प्रश्न

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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उत्तर

Ohm's law is true only if the temperature of the conductor is constant.

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पाठ 1: Electricity - Exercise 3

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संबंधित प्रश्‍न

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?


Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?


Find the expression for the resistivity of a material and state the SI unit of resistivity.


Name the physical quantity whose unit is "ohm".


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


  1. Draw a V-I graph for a conductor obeying Ohm’s law.
  2. What does the slope of V–I graph  for a conductor represent?

What is an ohmic resistor? Give one example of an ohmic resistor. Draw a graph to show its current voltage relationship. How is the resistance of the resistor determined from this graph?


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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. 


State the limitations of Ohm’s law.


SI unit of resistance is:


Ohm’s law states the relationship between power and voltage.


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What is ohmic device?


The variable resistance is called ____________.


The temperature of a conductor is increased. The graph best showing the variation of its resistance is:


Suppose there is a circuit consisting of only resistances and batteries and we have to double (or increase it to n-times) all voltages and all resistances. Show that currents are unaltered. Do this for circuit of Example 3.7 in the NCERT Text Book for Class XII.


State Ohm's Law. Represent it mathematically.


What is meant by resistance of a conductor ? Define its SI unit.


The circuit depicted in the figure is employed for studying Ohm’s Law. Instead of using a standard resistor, a student opts for a glass tube filled with mercury (tube 1), connected to the circuit through two electrodes, E1 and E2. He records the readings of the ammeter and voltmeter, thereby calculating the resistance. The student repeats the experiment by substituting tube 1 with tube 2, where the same amount of mercury fills tube 2.

Neglecting internal resistance of the cell use (> or < or =) to compare:

  1. the resistance in both the cases.
  2. the voltmeter readings in both the cases.
  3. the specific resistance in both the cases.

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