20) The potential as a function of distance is shown in the plot below. Which st

Question

20) The potential as a function of distance is shown in the plot below. Which statement is true? 20) 2 10 15 Distance (em) A) The electric field is zero at x-10 cm, its magnitude is at a maximum at x-5 cm, and the field is directed to the left there B) The electric field is zero at x-5 cm, its magnitude is at a maximum at x 0, and the field is directed to the right there. C) The clectric field is zero at x-0, its magnitude is at a maximum at x-15 em, and the field is directed to the left there D) The electric field is zero at x-0, its magnitude is at a maximum at x-5 cm, and the field is directed to the right there.

Explanation / Answer

E = - dV/dx

(A) at x = 10 , slope = dV/dx = 0

so E = 0

and x = 5 , dV/dx -> -ve

so E is directed to +_ve side that is to the right.

False

(B) x = 5 cm , E is not zero.

false

(C) x = 0 , dV/dx = 0 so E = 0

at x = 15 cm. slope does not have maximum value.

(D) True. as explained in a

Ans(D)

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