- “Kirchhoff’s” law is preferred over Ohm’s law. Why?
- Can we apply Kirchhoff’s law to both a.c. and D.C.?
- Kirchhoff’s laws are related to certain conservation laws. Explain?
- “Wheatstone bridge method of determination of resistance is considered to be more accurate than the voltmeter-ammeter method”. Why?
- When the Wheatstone bridge most sensitive?
- Wheatstone bride is not suitable for measuring very low and very high resistances. Why?
- A meter bridge wire is called a slide wire bridge. Why?
- It is better to get null deflection at the middle of the wire in a meter bridge. Why?
- What is meant by end correction for the meter bridge? How it can be reduced?
- What is potentiometer? What is its principle?
- What is potential gradient? What is the significance of it? Why it should be small for more accurate measurement?
- The potentiometer wire should be long and of uniform thickness. Why?
- The sensitivity of potentiometer wire can be increased by increasing its length. But we are usually satisfied with 10 m long wire. Why?
- Which instrument will you prefer to measure the emf of a cell: a high resistance voltmeter or potentiometer? Explain?
- Why are Meter Bridge and P. O. Box so named?
- While using post office box it is instructed that the cell key should tapped first and then the galvanometer key. Why?
- Why should the cross section of wire be uniform?
- What happens if the galvanometer and cell are interchanged at balanced point of a wheatstone’s bridge? Would the galvanometer show any deflection?
- What advantage is there in measuring resistance by using wheatstone bridge?
- A potentiometer is equivalent to a voltmeter of infinite resistance. Explain?
- Can the potentiometer wire be of copper? Explain?
- How would you convince that the principle of measurement of resistance of wire by Meter Bridge is based on Wheatstone bridge principle? Explain?
- If the length of wire be doubled what will be the effect on the position of null deflection in a potentiometer?
- What is the advantage of using a greater length of potentiometer wire?
- In Wheatstone bridge method why do we break the galvanometer circuit first and then the battery circuit?
- Why the connection between resistors in Wheatstone bridge or Meter Bridge are made of thick copper wires?
- Can Meter Bridge be used for measuring very low resistances?
- Why the jockey should not be pressed against the potentiometer wire?
- The emf of the driver cell should always be greater than emf of the cell to be measured. Why?
- Can you interchange the positions of the battery in the auxiliary circuit and cell whose emf is to b determined in potentiometer circuit diagram?
- Why the current should not be passed through the potentiometer wire for long time?
- Is it possible that there is no potential between the plates of the cell? If yes, under what conditions?
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