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## What are the similarities and differences in magnetic and electric field?

Similarities and differences in magnetic and electric field (Dilpreet posted this question)
Similarities
Differences
Both electric and magnetic field are conservative forcesBoth obey inverse square law
Both are non contact forces (Forces can be exerted without contact)
Both are attractive as well as repulsive (Like poles repel, like charges repel; unlike poles attract, unlike charges attract)
Electric field is produced by […] ## Electricfield, Magnetic Field and Photon

We know that photon has no charge. Then where from it gets electric and magnetic field in light?
Electric and magnetic fields are not produced by the photon; it is massless too.
But, photon is created by time varying electric and magnetic fields, usually produced by accelerated charges.
As you might have already learnt, a charge […] ## Solution to HC Verma Problem

“Referring to HC Verma Part 2, chapter 29, Electric field and potential, Q 69
I think that Force is inversely proportional to square of the distance between the charged particles, so acceleration is not constant and hence
v*v  =  u*u  + 2*a*s   is not valid in this case.
How is proceed with this question ?” Satyam asked

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“How do we know the direction of magnetic field around the current carrying conductor?” Asked Nikhil

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• magnetic field due to current in magnetic field ## Electric field inside a dielectric

Why does the electric field inside a dielectric decrease when it is placed in an external electric field?

The net electric field inside a dielectric decreases due to polarization. The external electric field polarizes the dielectric and an electric field is produced due to this polarization. This internal electric field will be opposite to the external electric field and therefore the net electric field inside the dielectric will be less

## Current electricity – Numerical

A 10m length of aluminium wire has a diameter of 1.5mm. It carries a current of 12A. Find (i) the current density. (ii) the drift velocity (iii) the electric field in the wire. aluminium has approximately 10^29 free electrons per m^3 ## Vibration of ferromagnet

Why a ferromagnet vibrates in a alternating magnetic field? 