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Physics: Post your doubts here!

K

khadijaimran

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hellodjfos;s'ff said:
There needs to be a force pulling the particle up to balance out the weight of the particle. The particle will continue to move horizontally if the vertical forces are balanced.
If you look at A, the electric field is downwards meaning the positive terminal is up and since the particle would be negatively charged, the positive terminal will apply a force to pull the electron up. This fits the idea I presented at the start, so A is the answer.
For B, it will be the opposite of option A. So the force acting on the electron will be in the direction of the weight so the electron will be pulled down(incorrect since it won't be solely left to right).
For option C and D, the particle will be pulled down again so the particle won't move left to right only. So they're incorrect too
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thank you so much!!
 
hellodjfos;s'ff

hellodjfos;s'ff

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Kanekii said:
View attachment 64122 How? View attachment 64123
Is the answer A for 24?
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13: You can form a right angle triangle with 3,4 and 5N forces which give a resultant force of 0. I have shown this in the attached picture. The resultant of the forces, 3N and 4N is 5N. This resultant can be opposed by the other 5N force available, hence the final resultant force is zero.
 

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Kanekii

Kanekii

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hellodjfos;s'ff said:
And yes, 24 is A. This is because if there are more layer of springs there will be more extension. Using F=kx, you would find that for the same load with a greater extension, the spring constant(k) decreases. Hence there will be less compression for the same load which is why A is the answer.
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If more layers are there extension will decrease and spring constant will increase*
 
hellodjfos;s'ff

hellodjfos;s'ff

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Kanekii said:
If more layers are there extension will decrease and spring constant will increase*
Click to expand...
Actually, I don't think A is the answer. A will cause more extension... and they are asking for which option will not have a desired effect. Clearly A is a desired effect since there is more compression.
 
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