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I have a question about voltaic cells. Let's say I dip Zn and Cu rods in a beaker of acid. My book says that Zn donates 2 electrons that travel through the circuit and to the Cu electrode. Cu...

My issue has been solved. How do I remove this question?

Unless you are preparing for mcq, it is best to learn how to solve ot rather than memorizing formulas. Nevertheless, if you need it, I will tell you how to derive a formula. Try yourself then. And...

I have successfully solved questions a,b and c.
(Answers: a=3 b=1 c= 4 size of ab=13)
Please help me with number d. Got totally stuck.

Okay this may seem silly. But isn't the total charge of a circuit always conserved? So what ever the arrangememt of capacitors are the total charge in the circuit mist be C. But if they want me to...

Shouldn't there be mutual inductance only when current changes? The current is not changing here. Then how can we have mutual inductance.
Even if current how can I calculate mutual inductance...


Wait a minute. While explaining this to a friend of mine, I realised that AEB and CFD Are also parts of the football field. So, how do I calculate the area of a field with the two semi circles...

I did some thinking on this. Maybe the potential is like Celsius for temperature. Anything at 0 degrees Celsius has internal energy. Similarly this loop at 0 potential can still do work by going to...

Aaaaah! I see. :) Thanks.


Well, I thought from work done in normal sense. Work done is the dot product of force and displacement. So of I move a fridge 3m above the ground, the work done will be 3*weight. If I let it down by...

No real problem with calcukation but I am thinking that If the rotation is 460 degrees, then the work done is equal to the work done in rotating it 460 minus 360 equals 100 degrees. Right?

Yes. I think of it analogous to a spring. It should like someone holding a stretched spring . If I hold the loop with my hands (not allowing it to move), it is like a stretched spring and must have...

For the final formula, you wrote v squared over 2 equals gm2/(x2x1)  GM2/d... You mean gm2/(x2x1) EQUALS gm2/d right?

Thanks for the explanation. :) now let me try my hand at this question.

If there is any shortcut for calculating velocity in terms of position or time, please tell me. Because I must prepare very well for physics Olympiad. If however they include very complex...

Oooooo! Got it.
And smoothy, I considered the junctions p, q, and r respectively. They are not in the picture. I considered them for the sake of discussion.
It is solved now. Thanks.

Please take a look at number b. Maybe I will need help in solving this. Let me try first. But what do they even want here? What does the critical velocity mean? And is B (beta) any constant here, or...

The teacher here redrew the first image as the second one. That's fine. But he went on to explain why the wire marked and crossed can be omitted. I did not quite get this part. This wire is connected...

I never thought it was that easy.
However if they asked me to calculate their velocity before they collided, I would probably have to use gpe to ke idea and law of conservation of momentum. Right?...



A video in khan academy beautifully derived a formula for this. It was finally nRt*ln(final volume/initial volume)... That's what I remember. So my final answer will be in terms of nrt. Is that...

Well the center of mass then should be closer to the mass 3m... And it is 3d/5 meters away from the mass 2m. Hey! Whatever the value of d is, the center of mass will always be at this setting. That...

Two particles of mass 2m and 3m are d meters apart and move toward each other due to the gravitational force on each other. What is the distance of the position where they collide to the starting...


Hi! Please take a look at the extract from my book. In the marked paragraph, they assumed that for any consideration, the amount of charge may be considered as centered at the center of the sphere. ...

I found this question in a tutorial video:
An alpha particle with kinetic energy equal to 11 mega electron volts is directed to a lead nucleus. How close will it get to the nucleus before the...

I can give you a hint. You need to break the tension in components. Vertical and horizontal. Vertical component equals tension times sine theta And horizontal component equals tension times cosine...

Oooooo! Confusion cleared. Thanks.

The question (in a tutorial video) was like this: find the electric field at a distance of .5m away from an infinite wire of charge density .25 micro coulumb/m. The solution used gauss law to solve...

Well, that 30/100 is converting feet to meters...

Yes I did make a mistake in my equation and I am extremely sorry for this. As I had a bad video quality, I mistook his "one half" as "one AND half". Reading your reply, I checked everything on online...

The teacher at ilectureonline.com was deriving a formula for magnetic field produced by an infinite current carrying wire. Then he reached a stage like that shown at the attachment. Now, if I put...

Okay, assume I correct the height to 34+19=53.
So the maximum pressure P the pump has to take is (53*30/100 meters) *density of water*g. But again, atmospheric pressure is pushing on the water...

hkstroud, I didn't mean MOVING the loop through magnetic field. I meant keeping it stationary and passing a changing magnetic field through it. But Your answer was informative. Thanks.
ebaines,...

Shouldn't the answer be equal to the difference in atmospheric pressure that rises in a height difference of 34 feet?
Any expert , please tell me if I am right or not.

Assume I have a rectangular loop of wire. Now changing magnetic flux through this wire will induce a current in it. But assume I cut one side of the loop and throw it away. So now I have only three...

Hey That's a nice shortcut!
Thankyou for everything.


Hi!
Please take a look at this question. The change in mass of this radioactive isotope can be calculated from this equation. But I don't know the mass of the products. If I had an equation for...

He he he... I guess I got confused by the complex notations in wiki. Thanks for making it clear.

Please take a look at the question I have attached here. For this, I found a wiki article for this formula that I have also attached here. However I found it complicated and didn't understand a word...

Understood. Thanks.
I have now prepared a complete working of this based on this answer and my understanding.

Please give me a hint on how to solve this. I have no idea how to start.
Two parallel light rays of wavelength λ originate from the same light source. During
Their journey, one of them had to...

Wait, the question is a bit vague. Do You want to know the TYPE of force the person 1 EXPERIENCES?

I understand. Thanks ebaines!

Yeah. The heading says it all.

I have no idea how to solve this question. Please tell me which physics concept I need to apply here.
The question has been attatched here. There is also a translation of this question in bengali...
