M Three equal negative point charges -q are plts in the figure. Which one of the

Question

M Three equal negative point charges -q are plts in the figure. Which one of the arrows shown represents the d center of the square 9) Page 3 of9 y are placed at three of the comers of a square of of side d as shown arrows shown represents the direction of the net electric ield at the A) A B) B C) C D) D 10) Two stationary point charges q1 and q2 are shown in the figure along with a sketch of some field lines representing the electric field produced by them. What can you deduce from the sketch? A) q1 is negative and q2 is positive; the magnitudes are equal. B) 41 and q2 have the same sign; the magnitudes are equal. C) q1 is positive and g2 is negative; the magnitude of gi is greater than the magnitude of q2. D) 41 is negative and q2 is positive; the magnitude of q1 is less than the magnitude of q2. B) 41 and 92 have the same sign; the magnitude of g1 is greater than the magnitude of q2. 11) A conducting sphere has a net charge of -6.4 10 C. What is the approximate number ot excess electrons on the sphere? A) 100 C) 300 E) 500 B) 200 D) 400 4.00 N. How far apart are these two charges? (k = 1/40 = 8.998 109 N-m2/C2) A) 2.10 m C) 3.12 m E) 1.13 m 2) The force of attraction that a -40.0 uC point charge exerts on a +108 HC point charge has magnitude B) 3.67 m D) 2.49 m

Explanation / Answer

solving the first problem

9)

the elctric field magnitude due to a point charge is given as

E = k*q/d^2

where q is the magnitude of charge , d is the distance of point from the charge ,

Now, the direction of field due to negative charge is towards the charge.

Here , the magnitude of electric field due to all charges is same on the centre.

Now, as the elctric field due to oposite corner on diagonal will cancel out ,

only the field due to empty field will be remaining

Hence , only field C is remaining

the correct option is C) C

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