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a ring of rdius 0.1m is made out of a metallic wire of cross section 10^6 m^2.the ring has a uniform charge of pi coulumb.find change in radius of ring when charge of 10^-7coulumb is placed at center of ring

a ring of rdius 0.1m is made out of a metallic wire of cross section 10^6 m^2.the ring has a uniform charge of pi coulumb.find change in radius of ring when charge of 10^-7coulumb is placed at center of ring

Grade:12

3 Answers

Piyush
askIITians Faculty 112 Points
6 years ago
New radius=r
consider the element which substends angle d(theta) at the center. At the two end points of the element tangential tension will be there ---> resolve it -----> only vertical comp. ----> equate this vertical comp.s with the force due to charge particle at the center on the element.
Akshita Goyal
17 Points
6 years ago
thank you sir but what will be value of tension?
Piyush
askIITians Faculty 112 Points
6 years ago
You can do this with other method find out tension with the above method keeping the radius as original one and find out young’s modulus in terms of R and dR. But young’s modulus is not given in the question check the question again.

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