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  1. rishi kesh

    I Why tan x=x as x approaches 0?

    Thanks for that
  2. rishi kesh

    I Why tan x=x as x approaches 0?

    This is the explanation i actually needed. But i want you to extend it a little bit, hopefully you will clear my doubt(please check my attachment). I will appreciate further reply from you :)
  3. rishi kesh

    I Why tan x=x as x approaches 0?

    But why is it true for radians only? I solved on my calculator and this is what i saw : Tan (0.12) = 0.12 (where 0.12 is radians) But when x is in degrees Tan(0.12) = 0.00209 What is happening here?please explain.
  4. rishi kesh

    I Why tan x=x as x approaches 0?

    Hi! In one of my textbook i saw the relation tan(x) = x where x is very small value and expressed in radians. I want to know why its true and how it actually works. I would appreciate someone's help :smile:
  5. rishi kesh

    Lorentz force and linear motors

    I have a picture below please have a look at it. The guy is using two conducting rods placed parallel to each other and placed below it are magnets. When battey is connected to rods and a conductor is placed over them it starts to move.That works according to flemmings left hand rule. I was...
  6. rishi kesh

    Derivative of -x using first principle

    Hey! I think i got it! When, f(x)= x^2 f(x+h)= (x+h)^2 If, f(x)= -x f(x+h)= -(x+h) = -x-h Is this right?
  7. rishi kesh

    Derivative of -x using first principle

    But how does that work? Why it isn't -x+h ?:oldconfused:
  8. rishi kesh

    Derivative of -x using first principle

    Homework Statement This is a silly question,but i have a problem.How do we solve derivative of -x using first principle of derivative. I know that if derivative of x w.r.t x is 1 then ofcourse that of -x should be -1. Also it can be solved by product rule taking derivative of -1.x . Homework...
  9. rishi kesh

    How to find the derivative of this function

    Here is a picture of what i've solve. Please tell me if its correct.
  10. rishi kesh

    How to find the derivative of this function

    Hi! I am sorry i tried but i couldn't solve it . I would greatly appreciate your help.
  11. rishi kesh

    How to find the derivative of this function

    Hi! Please give me a little bit of intuition about this. I will solve the rest. Thanks in advance !
  12. rishi kesh

    How to find the derivative of this function

    Homework Statement How do we find the derivative of function: y= √[(1-sinx)/(1+sinx)] This is the exercise problem from my textbook. I have not covered chain rule yet. So please you basic derivative rules to solve it. Homework Equations Here is the answer of derivative given in my textbook...
  13. rishi kesh

    How does an opamp work as non-inverting amplifier

    You explained it very clear now i got it!
  14. rishi kesh

    How does an opamp work as non-inverting amplifier

    Thank Oh yeah! But for me its cute :P
  15. rishi kesh

    How does an opamp work as non-inverting amplifier

    So when we have a negative feedback there is a very little difference between the voltages at inverting and non inverting inputs.and since op amps in practical have some finite gain the output will be amplified without rising up extremely high. Am i right?
  16. rishi kesh

    How does an opamp work as non-inverting amplifier

    Yes,this is where i have been reading from
  17. rishi kesh

    How does an opamp work as non-inverting amplifier

    Homework Statement I am doing a little bit of research about op amps. What i know so far from the book it that op amp have a very large open loop gain. To reduce the gain to desired amount we need resistor which connect output to invering terminal(negative feedback). Homework...
  18. rishi kesh

    Engineering Resultant magnetic flux in a 3-phase induction motor

    Okay. So what does negative sign mean ? Does it mean opposite direction? Like if right side is positive then left is negative?
  19. rishi kesh

    Engineering Resultant magnetic flux in a 3-phase induction motor

    Hi ! Sorry, but one more question is overwhelming me right now. Does the magnitude of resultant flux not get affected when we move -√3/2 by 180°. Is it okay to do so ?
  20. rishi kesh

    Engineering Resultant magnetic flux in a 3-phase induction motor

    Thanks so much i really got this concept clear today. I realized that what i didn't know is that vectors cant have negative magnitude now if i keep this in mind my concept about resultant flux is clearly understood. :) Im so thankful to you :)
  21. rishi kesh

    Engineering Resultant magnetic flux in a 3-phase induction motor

    Oh i got it! Here is one more attachment. This is how i need to think about it?
  22. rishi kesh

    Engineering Resultant magnetic flux in a 3-phase induction motor

    But the same one when i solve using cos60/2 :
  23. rishi kesh

    Engineering Resultant magnetic flux in a 3-phase induction motor

    Please explain me how to derive it to get resultant flux. I really need help.
  24. rishi kesh

    Engineering Resultant magnetic flux in a 3-phase induction motor

    Hi! Can you please solve this and send a picture right here? I will appreciate that. And also explain this little bit more.
  25. rishi kesh

    Engineering Resultant magnetic flux in a 3-phase induction motor

    Homework Statement I have some attachements below from my textbook. According to it the value of resultant flux is constant in magnitude and 1.5 times the maximum value of flux. But i have a doubt regarding how it is proved. The magnetic flux waveforms are 120° apart from each other and at...
  26. rishi kesh

    Instantaneous current in stator of 3 phase IM

    Please explain this to me in more detail if possible.sorry for inconvinience.
  27. rishi kesh

    Instantaneous current in stator of 3 phase IM

    I am studying induction motors and i have equation for instantaneous value of current flowing in each phases.(please check to image below).I can see that its it the form Im.cosωt But isnt it supposed to be Im.sinωt ?because thats how we find all instantaneous parameters like voltage and...
  28. rishi kesh

    What is significance of eulers number

    Thread moved by mentor why is 'e' so important number. e^x is said to be natural language of growth. Why isnt 2^x a 100% growth.Can anyone explain me the difference between both of these and also bit more about number e which known as famous constant.please explain clearly. I will appreciate it.
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