Question 1 This is the potential profile around charge aa projected onto an x-y

Question

Question 1 This is the potential profile around charge aa projected onto an x-y plane This is the potential profile around charge qo projected onto an xy plane This is the E field lines and equipotential surfaces around charge c This is the E field lines and equipotential surfaces around charge qo Among the four charges A, B, C, D which charges are positive, if any which charges are negative, if any which charges are not known to be positive or negative, if any Question 2 For the equipotential surfaces in this figure, what is the approximate direction of the electric field? a) Out of page b) Into page c) Toward the right d) Toward the left e) Upwarod f) Downward Question 3. Rank, from greatest to least the amount of Work done by the electric field (i.e. on a positively charged particle going 8 v al from A to B (W) b) from A to C(Wb) c) from D to E (W)

Explanation / Answer

Ans:

1) A,D shows the positive charges

2) C shows the negative charge

3) B is unable to say the charge either positive or negative

Reason: Electric field direction is always away from positive charge and it will be in the direction of maximum decrease in potential energy. In case of B it shows negative potential at the center which is unable to decide nature of charge

2) Option f

Reason: Electric field direction is always in the direction of maximum decrease in potential energy

3) Wb>Wc>Wa

Reason: Wa=0 , because work done bya unit positive test charge q bringing from one point to another is zero on equipotential surface

And Wb= q(Va-Vc)=2q

Wc= q(Vd-Ve)=q

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