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

A simple pendulum is inside a spacecraft. What will be its periodic time? 

What is Solenoid?

What is Toroid?

A solenoid of length 50 cm of the inner radius of 1 cm and is made up of 500 turns of copper wire for a current of 5 A in it. What will be the magnitude of the magnetic field inside the solenoid? 

Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid Why?

A toroid of 4000 turns has an outer radius of 26 cm and an inner radius of 25 cm. If the current in the wire is 10 A. Calculate the magnetic field of the toroid. 

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.

Using Ampere's Law, derive an expression for the magnetic induction inside an ideal solenoid carrying a steady current.

Obtain an expression for the decay law of radioactivity. Hence show that the activity A(t) =λN_O e^-λt.  

Obtain an expression for magnetic induction of a toroid of ‘N’ turns about an axis passing through its centre and perpendicular to its plane.

A conducting rod along the equator is 1 m long and carries a current of 15 A from east to west. The magnitude of Earth's magnetic field at the equator is `4/3 xx 10^(-4)` T. The magnitude and direction of the force on the rod are ______.

Why does hot soap water help to remove tough stains on a fabric?

The half-life of `""_82^210Pb` is 22.3 y. How long will it take for its activity 0 30% of the initial activity?

For a solenoid and a toroid, the number of turns per unit length is n and the respective interior volume is V. The self inductance is proportional to n² and V for ______.

A current of 10 A passes through a coil having 5 turns and produces magnetic field at the centre of the coil having magnitude 0.5 x 10^-4 T. Calculate diameter of the coil.

(µ₀ = 4π x 10^-7 Wb/Am)  

Why a detergent powder is mixed with water to wash clothes?

For polyatomic molecules having 'f' vibrational modes, the ratio of two specific heats,Cp/Cv  is..........

On what factors do the degrees of freedom depend?

State the law of equipartition of energy and hence calculate the molar specific heat of mono-atomic and di-atomic gases at constant volume and constant pressure.