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Physics / Re: Magnetic field lines or magnetic lines of force ?explain?
« Last post by Neema Tyagi on June 14, 2016, 01:04:39 PM »
  The curve the tangent to  which any point give the direction of magnetic field at that point .
                                                or
  The path along which a  unit north pole would tends to move if free to do so . 
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Physics / Re: Electricity
« Last post by Neema Tyagi on June 14, 2016, 12:55:02 PM »
Silver is the best conductor of electricity
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Physics / Electricity
« Last post by M.S.Gautam on June 03, 2016, 04:20:06 PM »
Which substance is the best conductor of electricity?
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Physics / Re: Define Maxswell's right hand thumb rule
« Last post by M.S.Gautam on June 03, 2016, 03:59:49 PM »
If we hold a straight wire in our right hand then our thumb indicating the direction of current  and fingers encircle the wire,. indicating the direction of magnetic field
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General Discussion / hii
« Last post by Rashmi Singh on June 03, 2016, 12:56:05 PM »
Hi ...everyone... i m rashmi singh
 :)
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Mathematics / Re: Solve probability
« Last post by vishwafunda on January 14, 2016, 11:07:50 AM »
Let E : all the three occupy the same cell
     F : atleast two of them occupy the same cell
Required Probability, P(E/F) = [P(E intersection F) / P(F)]
                                      = 3/21
                                      = 1/7
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Following table shows the marks scored by a group of 90 students in a mathematics test of 100 marks.

The probability that a student obtained less than 20 marks is ____.

A) 7/90
B) 11/90
C) 23/90
D) 20/90
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Mathematics / Solve..
« Last post by Kishor Chaudhary on January 14, 2016, 09:31:26 AM »
Three distinguishable balls are distributed in three cells. Find the conditional probability that all the three occupy the same cell, given that at least two of them are in the same cell.





http://zeacreations.com


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Mathematics / Re: differentiation and integration
« Last post by vishwafunda on October 11, 2015, 09:52:23 PM »
Differentiation and Integration are very wide concepts of Calculus. In simple way, we have to learn some basic formulae, then can apply in basic questions.

Differentiation :
1. derivative of a constant function is zero.
2. derivative of x^n is nx^(n-1).
3. derivative of e^x is e^x.
4. derivative of a^x is a^x.loga
5. derivative of log x is 1/x.
6. derivative of sinx is cosx.
7. derivative of cosx is -sinx.
8. derivative of tanx is sec^2 x.
9. derivative of cotx is -cosec^2 x.
10. derivative of secx is secx.tanx
11. derivative of cosecx is -cosecx.cotx


Integration is called anti-derivative. This is just converse of derivative.
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Mathematics / differentiation and integration
« Last post by M.S.Gautam on October 11, 2015, 09:41:59 PM »
Please tell me simple method to study differentiation and integration.
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