A positive point charge is placed inside a non-spherical rubber balloon. The bal

Question

A positive point charge is placed inside a non-spherical rubber balloon. The balloon is originally neutral and the point charge never touches the balloon. The point charge is located at the center of the balloon. Which of the following statements is true? non-spherical balloon (cross-section) a) The electric flux through the balloon would increase if the balloon was blown up more. b) The electric field has the same strength everywhere on the surface of the balloon. c) The electri flux through the balloon changes if the point charge moves to a new position inside the balloon. d) The net charge of the balloon itself is zero. e) All of the above statements are true.

Explanation / Answer

(A) from Gauss law,

electric flux through closed surface = Q_inside / e0

independent of volume or area of ballon.

so flux will remain constant.

False

(B) No, surface is not quidistant from charge so field will not be same.  

False

(C) as explained above in A, flux will change only when magnitude of charge changed.

otherwise it will remain same.

False

(D) ballon was neutral and charge did not touch it.

So yes, ballon has zero charge.

True

Ans(D)

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