HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Physics

Explain refraction of light on the basis of wave theory. Hence prove the laws of refraction

When the balance point is obtained in the potentiometer, a current is drawn from ______.

Why is it useful to define the radius of gyration?

Define a Potentiometer.

Define potential gradient of the potentiometer wire.

Why should not the jockey be slided along the potentiometer wire?

Discuss the necessity of radius of gyration. 

Answer in brief:

State the conditions under which the theorems of parallel axes and perpendicular axes are applicable. State the respective mathematical expressions.

How is potential gradient measured? Explain.

State the uses of a potentiometer.

What are the disadvantages of a potentiometer?

Distinguish between a potentiometer and a voltmeter.

What will be the effect on the position of zero deflection if only the current flowing through the potentiometer wire is increased?

Describe how a potentiometer is used to compare the EMFs of two cells by connecting the cells individually.

Describe with the help of a neat circuit diagram how you will determine the internal resistance of a cell by using a potentiometer. Derive the necessary formula.

A battery of emf 4 volt and internal resistance 1 Ω is connected in parallel with another battery of emf 1 V and internal resistance 1 Ω (with their like poles connected together). The combination is used to send current through an external resistance of 2 Ω. Calculate the current through the external resistance.

A potentiometer wire has a length of 1.5 m and a resistance of 10 Ω. It is connected in series with the cell of emf 4 Volt and internal resistance 5 Ω. Calculate the potential drop per centimeter of the wire.

A potential drop per unit length along a wire is 5 × 10⁻³ V/m. If the emf of a cell balances against length 216 cm of this potentiometer wire, find the emf of the cell.

Find the equivalent resistance between the terminals of A and B in the network shown in the figure below given that the resistance of each resistor is 10 ohm.

If a = 0.72 and r = 0.24, then the value of t_r is ______.