Question1 Two points are lying on the y axis as shown in the figure. Charge i Th

Question

Question1 Two points are lying on the y axis as shown in the figure. Charge i They are equidistant (same distance) from the point P, which lies on r axis. 1 q,--4.0 C and q2 = +4.0 C. he net electric field 91 0.700 m 31.0 31.0P 0.700 m 92 at P is. (1) E (2) E = 7.56 × 104 N/C. (3) E 5.04 x 102 N/C. (4) E 3.78 x 104 N/C. ON/. (5) None of the above. Question 2 wo identical small conducting spheres are separated by 0.60 m. The spheres carry different amounts of charge and each sphere experiences an attractive electric force of 10.8 N. The total charge on the two spheres is -24 uC. The two spheres are now connected by a slender condu then removed. The electric force on each sphere is closest to (1) 12.4 N, repulsive. (2) 3.6 N, attractive. (3) 5.4 N, attractive. (4) 3.6 N, repulsive. (5) None of the above.

Explanation / Answer

1) magnitude of Electric field due to charge = kQ/r^2

= 9*10^9*4*10^-6 / 0.7^2

= 7.35*10^4 N/C

direction of EF due to negative charge = towards the charge

direction of EF due to positive charge = away from the charge

the horizontal component will balance will out

the net EF = 2*E * sin a

= 2*7.35*10^4* sin 31

= 7.56*10^4 N/C

so option 2) is the correct answer

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