a plate is given a charge q and another plate (uncharged) is brought near the plate. Induction occurs and each of the four surfaces in question acquire charges as +q/2, +q/2, -q/2, +q/2. (shown in fig1)

The fourth surface on grounding results in which distribution -

(A),(B),(C) --->see figure 2 , (D) none of these.

 

 

Answer - (A).

 

Why (A) and why not (B) ???

 

 

Please explain

any one having rd sharma obj. maths...

 

please chk pg. 8.10

 

Please explain the proof of the theorem 3 under PERMUTATION UNDER SPECIAL CONDITIONS.

 

Theorem:- The no. of permutations of n diff. things taking r at a time in which two specified objects always occur together is 2!(r-1).^{n - 2}P_{r - 2}.

 

Proof:- First let us leave out the two specified objects Then the no. of permutations of remaining n-2 objects taken r-2 at a time is ^{n - 2}P_{r - 2}. Now we consider the two specified objects temporarily as a single object and add it to each of the ^{n - 2}P_{r - 2} permutations which can be done in r-1 ways. Thus the no. of permutations becomes (n-1).^{n - 2}P_{r - 2}. But the two specified things can beput together in 2! ways. Hence the reqd. no. of permutations is

2!.(n-1).^{n - 2}P_{r - 2}.

 

Why that r-1ways.. ??????

what type of connection is this ??

 

BUT HOW ????

v = velocity with which ball falls

v1 = velocity with which hemisphere moves

v2 = vertical component of velocity with which ball moves after collision

v3 = horizontal component of velocity with which ball moves after collision

 

m = mass of ball

M = mass of hemisphere

 

 

 

can we apply conservation of momentum here.... ???

 

The answer is NO

 

 

BUT WHY ??

i think that 1gb includes temporary internet files....

so ur extra downloaded things plus 4-5 hrs daily usage might have led to such enormous bill.

 

So please verify that thing, is it for seperate download of applications, songs, videos, softwares etc or does it include temp. internet files. If yes, then it might be possible as 4-5 hrs regular usage for 2 months is quite a big thing..

please solve HCV friction, q. 15

 

the question is -

The friction coeff. between an athlete's shoes and the ground is 0.90. Suppose a superman wears this shoesand races for 50m. There is no upperlimit on his capacity of running at high speeds. (a) Find the mnimum time that he will have to take in completing the 50m starting from rest. (b) Supose he takes exactly this minimum time to completethe 50m, what minimum time will he take to stop?

 

 

 

How to do this?

If we take retardation, then why does the superman go 50m starting from rest ?

and if we take acceleration, then why does he come to rest ? 

why do not we hav poles inside the magnet...?

i know that u'll say n-poles and s-poles neutralise each other...
but how ??
n-pole and s- pole back to back create field in same direction na ??

 

 

 

 

 

 

 

 

and answer the remaining ques. plz...

 

Q: what is the use of placing the magnet in magnetic meridian while tracing the lines of force and locating the poles ?

what will happen if we dont do so ?

 

 

 

Q: why poles are not at extreme ends of a bar magnet and a bit inside ?

 

 

 

Q: why do new poles develop when we break a magnet ? 

what does the multiplication of vernier scale division and vernier constant give (physical significance) ?

and how ?

 

please dont giv the answer as ' vernier scale reading '

 

explain how u came to your answer...

for an arbitrary fn. y=f(x) _{[ a]}^{[ b]} f(x)dx represents area bounded by the curve bet^n x = a and x = b.

what will it represent if we divide the above integral by the lenght of ab.

 

 

eg. y = sin(x)

So     { _{[ 0]}^{[ ]} sin(x)dx } /  = ?

 

 

 

 

sorry ... i wrote it for anil kapoor...

but while posting many replies came in bet^n....