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Current Electricity

how to this question , i cant even understand it
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Transformer AC

Why are the 2 resistances (15 kiloohm and 7 kilohm) being considered in series?
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Sounds?

what questions is this , is this in jee mains syllabus? if yes then how to do
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Aromatic vs ring strain

I was under the impression ring strain would matter more but they haven't considered that at all
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goc

pata nai kaise 2nd hai..help needed :?
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Differential Equation pyq

Shouldn't the solution to d.e. be arcsin(x)+arcsin(y)=pi/2?
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NLM ADVANCED

In my first attempt as well as the solution of the question, it is given that for the minimum amount of F applied block A would have a tendency to move to the right and B would have a tendency to move down but why? Max ka to I understood we have solved multiple problems but minimum me why is the blocks tending to move in the directions I described above?...
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Binomial theorem/Series

I need help with questions 7 and 18. How does one solve these? I multiplied (1+x)³⁰ and (1-x)³⁰ for Q7, but got stuck midway. For Q18, I got 0, but the answer is -30C15. Idk where I went wrong....

Hydrocarbons

Can someone explain how this happened
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Cl2+hv

plz give an exp. for product A
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Stability of conj. base

plz explain this order of stability of conjugate base PFA...
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Limits pain

33 This just hurts...
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EMI+Mechanics Doubt

How to go about option (3) and (4)?
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Limits

Let's see if I remember how to type this out. $\lim_{x \to 0}\frac{cos(sinx)-cosx}{x^4}$ ...