index-sq-ch2-p12

June 1, 2020 Current Electricity, Conceptual Questions 15 Comments

PHYSICS
Class 12

Conceptual Questions
Chapter 12

Question 1	Why it is not possible to measure the drift speed of electrons by timing their travel along a conductor? See answer
Question 2	The relationship R = V/I tells us that the resistance of a conductor is directly proportional to the potential difference applied to it. What do you think on this proportion? See answer
Question 3	A heavy duty battery of a truck maintains a current of 3 amperes for 24 hours. How much charge flows from the battery during this time? See answer
Question 4	While analyzing a circuit, the internal resistance of the source is ignored. Why? See answer
Question 5	Under what circumstances, the terminal potential difference of a battery exceeds its emf? See answer
Question 6	What is the difference between emf and P.D? See answer
Question 7	The loop rule is based on the conservation of energy principle and the junction rule on the conservation of charge. Explain how these are based on these principles? See answer
Question 8	Why rise in the temperature of a conductor is accomplanied by a rise in the resistance? See answer
Question 9	Does the direction of emf provided by a battery depend on the direction of the current flowing through the battery? See answer

Tagged Question 1: Describe the concept of steady current as a flow of positive negative or both. Define the unit of current., Question 2: Explain the electronic current in a metallic wire as due to the drift of free electrons in the wire., Question 3: State Ohm’s law. Discuss its scope and validity (a) Discuss resistivity and conductivity of a material (b) How does resistance change with temperature?, Question 4: Explain the terms: emf, Question 6: What is wheat stone bridge? Explain with diagram the balancing the principle and the working of this bridge., Question 8: What is thermocouple? Explain the working of thermocouple by drawing its diagram. By sketching curve explain the variation in thermoelectric emf with temperature.

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