Electricity and Magnetism Answers

Calculate the directivity of an antenna for θE = 30°, θH = 60

The velocity of electromagnetic wave in a good conductor is

A.3 x 10⁸ m/sB.more than 3 x 10⁸ m/sC.very lowD.high

What is magnetic field due to toroid.

What is electric flux density.

The two plates of a capacitor hold +2800 µC and -2800 µC of charge,

respectively, when the potential difference is 930 V. What is the capacitance? 

Calculate induced emf induced in a coil having radius 2 cm and containing 320 turns placed in a time varying magnetic field. The plane of coil is perpendicular to the magnetic field whose expression for is given by:

B=(0. 0120T/s)t + (0.00035T/s⁴)t⁴

The coil is also connected to 300 Ω external resistor.

Suppose earth and moon carry + charges of equal magnetude. How large would charge need to be to produce an electrostatic repulsion equal 1% of gravitational attraction between the 2 bodies?

Calculate the electric field strength at a point in space where a proton

experience an acceleration on 1.8 million “g’s”.

1- Find electric field intensity due to dipole of dipole moment 4.4x10^-19C-m at a point 30nm away along bisector axis?

2- A point charge of 1x 10^-6C is at centre of Gaussian surface with cubical shape 1m on edge. Find flux through surface? 

3- Consider a point charge 2C, what is the radius of equipotential surface having potential 20V? 

Explain electrostatic potential