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Ask Physics has a new look now

As per the requests and suggestions by the members and students, the look and feel of Ask Physics is changed now. Hope you like it.

Your suggestions for further improvements are always welcome.

Cable transmission of signals

How is it possible to transmit a no. of channels through the same cable ?
Is it based on the concept of Bandwidth ?

In a cable TV system, each channel is assigned a range of frequency (6-8MHz range)

Electric Flux

From: Nancy James

Subject: Electric flux
Message Body:
Could some one please explain what is written in the ncert book of PHYSICs class XII about ‘electric flux’?

Save the images, open and zoomin to read

Resolution of Vectors

From: Vakas

Subject: Resolution with geometry
Message Body:
Dear sir,
I m not able to understand that when we resolute mg in a inclined plane that plane having angle theta,how does the vertical component goes through inclined surface & cos comp opp to N.
explain with geometry so that i don’t get confused in future in determining the two comps is right direction.

Ans:

In a right angled triangle,

$cos\theta =\frac{adjacent side}{hypotenuse}$

and

$sin\theta =\frac{opposite side}{hypotenuse}$

When mg is resolved into mutually perpendicular directions, one parallel to plane and the other perpendicular to the plane (opposite to the Normal reaction), the component which is adjacent to θ is the cos component and the one away from θ is the sine component.

Students find difficulty ,mainly in identifying the angle .

See the diagram below and try to analyze