Doubts in Physics

2020 doubt doubtion

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Is it a?

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Yes bro, I am also getting A. @Aastik_Guru

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Same bro…

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yeah it is a

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Ans : A,D

Ans : A,C,D

Detailed Explanation, please

@Cooljet123 @Rudra_d @AshWin @Aastik_Guru @Abhijit @Kshitijranaw

PS: The surface tension solution is given below by @Abhijit And some crucial explanation by @Rudra_d 's sir

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Question 7 all options can be found by amperes circuital law bro. Can’t give details now as I’m on bed sleeping ( rather trying to sleep). I can show you the loops if you need.

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For question 8
You can find torque by M=iNA and torque = M×B
Then find alpha as torque=I×alpha
But the problem is about what axis totake I. See the loop will try to align it’s magnetic moment vector along magnetic field. So it will rotate about a vertical axis passing through centre. I’ll show you…

And since magnetic field is uniform net force on loop is 0. So com won’t undergo any motion.

Also loop is rotating due to torque by magnetic field.

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For question 6
Refer this

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@Abhijit Thanks man, I actually got this one in morning before signing into the website…

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Yeah all is ohk! I was confused with the (X-Z) plane and the diagram and now it’s ohk… The plane is kept on the X-Z plane… didn’t realize this first and left the problem

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Option A and C kaise differentiate karenge
@Aswin24 @Rudra_d @Binod @Aastik_Guru @everyone

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A me to right side me sirf ek hi straight line wala field line dikhaya hai. Aur bhi to hoga na upar aur niche…

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Tum ans kya bolna chahte ho c na

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Ha

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Bro ans a hai ham bhi c hi mare aur hame -1 mila :sob:

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Hm… dekhta hu fir. Shayad C me jo edtra field lines draw kiya gaya wo galat hai.

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@Vibhu_Kumar bro the number of field line going in and out of a charge is directly proportional to magnitude of charege so Q1/Q2 = 6/3…

Count the field line in the options and make sure u go with the right direction

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