Coulomb's Law (Electric Force) Video Lessons

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Problem: Three point charges are arranged as shown in Figure. (a) Find the vector electric field that the q = 7.50 nC and -3.00 nC charges together create at the origin. N/C  +      N/C (b) Find the vector force on the 5.00 nC charge.

FREE Expert Solution

Electric field:

E=kqr2

Coulomb's force:

F=qE

(a)

k = 9.0 × 109 N•m2/C2

Ex = (9.0 × 109 × 7.50 × 10-9)/0.3002 = 750 N/C

Ey = (9.0 × 109 × -3.00 × 10-9)/0.1002 = - 2700 N/C

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Problem Details

Three point charges are arranged as shown in Figure. 

p23-16alt.gif


(a) Find the vector electric field that the q = 7.50 nC and -3.00 nC charges together create at the origin.

 N/C i hat bold +      N/C j hat bold

(b) Find the vector force on the 5.00 nC charge.

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