7 Suppose a uniform electric field exists in the room in which you are working,

Question

7 Suppose a uniform electric field exists in the room in which you are working, such that the lines of force are horizontal and at right angles to one wall. As you walk toward the wall from which the lines of force emerge into the room, are you walking toward (a) points of higher potential? (b) points of lower potential? (c) points of the same potential (equipotential line)? .8 A charge Qis uniformly distributed throughout a sphere of radius a. Taking the potentia at infinity as zero, the potential atr-b a is dr dr dr .9 A potential field is given by V 3xy-yz. Which of the following is not true? (a) At point (1,0,-1), V and E vanish (b) x2y = l is an equipotential line on the xy-plane. (c) The equipotential surface V =-8 passes through point P2,-1.4). (d) The electric field at Pis 12a 8a, -a. Vim (e) A unit normal to the equipotential surface V- -8 at P is -0.83a, 0.55a, 0.07a 10 An electric potential field is produced by point charges 1 C and 4 C located al (-2, 1, 5) and (1,3,-1), respectively. The energy stored in the field is (a) 2.57 m] (b) 5.14 mJ (c) 10.28 mJ (d) None of the above

Explanation / Answer

Ans 7. (a) Points of higher potential

Ans 8. (c)

Ans 9. (a) At point (1,0,-1),V and E vanish

Ans 10. (b) 5.14 mj

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