EASY
12th CBSE
IMPORTANT
Earn 100
State the working principle of a potentiometer. Explain, with the help of a circuit diagram, how the emfs of two primary cells are compared by using a potentiometer. How can the sensitivity of a potentiometer be increased ?
Important Questions on Current Electricity
EASY
12th CBSE
IMPORTANT
State the principle of a potentiometer. With the help of a circuit diagram, describe a method to find the internal resistance of a primary cell.
MEDIUM
12th CBSE
IMPORTANT
You are required to find the internal resistance of a primary cell in the laboratory. Draw a circuit diagram of the apparatus you will use to determine it. Explain the principle of the experiment. Give the formula used.
EASY
12th CBSE
IMPORTANT
Why is the use of a potentiometer preferred over that of a voltmeter for the measurement of emf of a cell ?
EASY
12th CBSE
IMPORTANT
Use Kirchhoff's rules to obtain conditions for the balance condition in Wheatstone bridge.
EASY
12th CBSE
IMPORTANT
For the circuit diagram of a Wheatstone bridge shown in the figure, use Kirchhoff's laws to obtain its balance condition.
EASY
12th CBSE
IMPORTANT
State, with the help of a suitable diagram, the principle on which the working of a metre bridge is based. Under what condition is the error in determining the unknown resistance minimized?
EASY
12th CBSE
IMPORTANT
Draw a circuit diagram which can be used to determine the resistance of a given wire. Explain the principle of the experiment and give the formula used.
EASY
12th CBSE
IMPORTANT
Draw a circuit diagram using a metre bridge and write the necessary mathematical relation used to determine the value of an unknown resistance. Why cannot such an arrangement be used for measuring very low resistances ?
