Q. Consider a rectangle whose edges are of sides a and b, and are parallel, resp

Question

Q. Consider a rectangle whose edges are of sides a and b, and are parallel, respectively, to the ^x and ^y axes. A uniform E-eld ~E = Ex^i + Ey^j + Ez^k is applied. What is the flux ?E of the E-eld through the rectangle?
(a) ?E = aEx + bEy.
(b) ?E = 0
(c) ?E = abEz
(d) ?E = (a + b)Ez

Q. A point charge q is located at the origin. Consider three spherical surfaces of radii: 1 cm ; 2 cm ; 3 cm, that surround this charge. The fluxes of the E-eld through these surfaces are denoted: ?1;?2;?3, respectively.

(a) ?1 <? 2 < ?3
(b) ?1 > ?2 > ?3
(c) ?1 = ?2 = ?3

Explanation / Answer

1) only field perp to surface matters

Q = flux * A = Ex a b so c)

2) net flux = qenc/e0

all contain samge charge so same flux

so c)

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