Two point charges are separated by 25.0 cm. Assume that q1=6.40nc and q2=13.5nc

Question

Two point charges are separated by 25.0 cm. Assume that q1=6.40nc and q2=13.5nc
Find the magnitude of the electric field these charges produce at point A


Find the magnitude of the electric field these charges produce at point B
What would be the magnitude of the electric force this combination of charges would produce at A?

Find the magnitude of the electric field these charges produce at point B
What would be the magnitude of the electric force this combination of charges would produce at A?


10.0 cm 10.0 cm 25.0 cm-

Explanation / Answer

at point A

EA=E1~E2

EA=kq1/r12~kq2/r22

EA=9x109 x 10-9 (6.4/0.152~13.5/0.12)

EA=9590N/C

at point B

EB=E1+E2

EB=kq1/r12+kq2/r22

EB=9x109 x 10-9 (6.4/0.12+13.5/0.352)

EB=6752N/C

force at A

FA=kq1q2/r2

FA=9x109 x 6.4x 10-9 x13.5x10-9/0.252

FA=12441x10-9N=12.44x10-6N

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