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Himanshu posted an Question

June 24, 2020 • 01:30 am

30 points

IIT JAM
Physics (PH)

Electricity numerical graph

there is a graph asked between electric field & radius of sphere. just tell how they write combined equation that is in box by using the above two

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Dhairya sharma

the plot is all about dependency of electric filed w.r.to distance. see my attachment carefully which i hv already attached. in that u will find that R is radius of sphere , which is constant and functional form will depend only on r.
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and now you will see that inside sphere is depend linearly on r and outside r it depends as 1/r^2 . and we can draw them as shown in your figure
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i hope u will understand it
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if u have any doubt plz ask
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hope it will help u
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Dhairya sharma

see attached carefully
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yes ma'am
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Ruby negi Best Answer

and u know why I am saying this, because when u r finding e.f inside the sphere then the charge density is only in the sphere of radius r but when u are finding e.f outside the sphere then the charge density is at the sphere of radius R(means in whole sphere)..
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Ruby negi

dear, the boxed equation is not an overall equation.. in case of finding e.f in inside the sphere u have to put R=r so that e.f =pho/3*epilson*r and in case of outside , R remains same.
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for any doubt do let know
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mam can you please provide me this cases & all u said in written as it involves function so it is not that much clear in chat
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yeah
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do u want whole solution ? or only equations.. if u want equation I attached a page.
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for derivation, do let me know
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