List of top Physics Questions on Electromagnetic Theory and Electronics asked in UP Board XII

The unit of \( \sqrt{LC} \) (where \( L \) is inductance and \( C \) is capacitance) is:

Explain the difference between the following substances with the help of examples: 

(i) Paramagnetic 
(ii) Diamagnetic 
(iii) Ferromagnetic

On what factors does the magnetic flux linked with a coil depend? Explain the induced electromotive force on the basis of the following:
(i) Cause
(ii) Magnitude
(iii) Direction
On what principle does the transformer work? State the following conditions for an ideal transformer:
(i) Leakage of magnetic flux
(ii) Resistance of primary coil
(iii) Resistance of secondary coil
(iv)Dissipation of power
A plane electromagnetic wave is represented by the equation \[ E = 100 \cos(6 \times 10^8 t + 4x) \, \text{volt/metre}. \] Calculate the following:
(i) The refractive index of the medium
(ii) The velocity of electromagnetic wave in the medium
(iii) The expression for magnetic field
A proton, a deuteron and an alpha particle of same velocity enter perpendicularly in an uniform magnetic field of \( 10^5 \) tesla. Calculate the ratio of their time periods of revolution.
If \( \varepsilon_0 \) and \( \mu_0 \) represent permittivity and permeability of free space, then \( \frac{1}{\sqrt{\varepsilon_0 \mu_0}} \) represents which physical quantity?
Which of the following is the unit of electric flux?
Which type of field is produced around a current carrying conductor and why?
What is displacement current? A plane electromagnetic wave of 25 MHz frequency is propagating along the x-axis in vacuum. The electric field at any point in the vacuum is \( \vec{E} = 6 \hat{j} \) volt/metre. What is the magnitude and direction of the magnetic field \( \vec{B} \) at this point?
What are the microwaves? State one use of them.