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# Daily Archives: September 16, 2011

## Weak in Physics ?

aalap

Ans

I think you can write an essay about a bike that you have seen only once.How? Just because of your perception

Try to understand the concepts. You may be trying to by heart the topics .Avoid that .Develop the habit of writing and studying

## Horizontal projectile and freely falling body

A rifle at a height H aimed horizontally fires a bullet to the ground. At the same time , a bullet with the same mass in dropped from the same height. Neglecting air resistance, which one hits the ground first?Explain.

ED posted

Both will hit the ground simultaneously.

When a body is projected horizontally, its initial vertical velocity is zero and vertical acceleration is g, the acceleration due to gravity.

The values of a velocity and acceleration of a freely falling body are also the same.

So, both will hit the ground simultaneously

## 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 a charge whether at rest or in motionBut magnetic field is produced only by a moving charge   The total magnetic flux through any closed surface is always zero, but the total electric flux through any closed surface is equal to the net charge enclosed by the surface multiplied by the reciprocal of absolute permitivity Electric field lines are discontinuous as they have a starting point (+ charge) and an ending point (- charge); But magnetic field lines are continuous, they always form closed loops

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