HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Important Questions for Physics

What are coherent sources of light? 

A solenoid of length π m and 5 cm in diameter has a winding of 1000 turns and carries a current of 5 A. Calculate the magnetic field at its centre along the radius.

Derive the expression for magnetic field produced by a current in a circular arc of wire.

Distinguish between diamagnetic and paramagnetic substances.

What is Magnetic intensity?

Obtain an expression for the orbital magnetic moment of an electron rotating about the nucleus in an atom.

State SI unit of Magnetization.

State the principle on  which transformer works.

State Lenz’s Law.

What is electromagnetic induction?

State applications of eddy currents.

An alternative voltage given by V = 140 sin 314t is connected across a pure resistor of 50 Ω. Find

1. The frequency of the source.
2. The rms current is through the resistor.

An electron, a proton, an α-particle, and a hydrogen atom are moving with the same kinetic energy. The associated de Broglie wavelength will be longest for ______.

Distinguish between diamagnetic and paramagnetic substances.

What is Magnetic intensity?

State SI unit of Magnetization.

State the principle on  which transformer works.

What is electromagnetic induction?

Draw the circuit diagram of a half-wave rectifier. Hence explain its working. 

Write the functions of three segments of a transistor.