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

A toroid of a circular cross-section of radius 0.05 m has 2000 windings and a self-inductance of 0.04 H. What is (a) the current through the windings when the energy in its magnetic field is 2 × 10⁻⁶ J and (b) the central radius of the toroid?

Find the reactance of a coil of inductance 100 mH at a frequency of 50 Hz.

Derive an expression for energy stored in a capacitor.

In LCR series circuit, the condition for current resonance is ______.

In a capacitor of capacitance 20 µF, the distance between the plates is 2 mm. If a dielectric slab of width 1 mm and dielectric constant 2 is inserted between the plates, what is the new capacitance?

A body of mass 0.5 kg performs SHM with amplitude 3 cm and force constant 10 N/m. Find its total energy.

What is meant by magnetic coupling coefficient?

What is a rejector circuit?

What are the Uses of rejector circuit?

What is binding energy of a hydrogen atom?

The current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is ______.

The energy of the free surface of a liquid drop is 5π times the surface tension of the liquid. Find the diameter of the drop in C.G.S. system.

Derive Laplace’s law for spherical membrane of bubble due to surface tension.

Which logic gate corresponds to the truth table given below?

State Wein's displacement law

The surface tension of water at 0°C is 75.5 dyne/cm. Calculate surface tension of water at 25°C.

(α for water = 2.7×10^-3/°C)

Derive an expression for excess pressure inside a drop of liquid.

Angle of contact for the pair of pure water with clean glass is _______.

A raindrop of diameter 4 mm is about to fall on the ground. Calculate the pressure inside the raindrop. [Surface tension of water T = 0.072 N/m, atmospheric pressure = 1.013 x 10⁵ N/m² ]

Draw a neat labelled diagram showing forces acting on the meniscus of water in a capillary tube.