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Example 2. Three point charges of +8 x 10°C, +32 x 10-°C and +24 x10-°C are placed at the corners A, B and C of a square ABCD havingeach side 4 cm. Find the electric field intensity at the corner D. Assumethat the medium is air. |
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Answer» ANSWER:q A =8×10 −9 C q B =32×10 −9 C q C =24×10 −9 C Electric field intensity at D:E D = r AD 2
kq A
+ r BD 2
kq B
+ r CD 2
kq C
where r AD is the distance between A and D and so on.. E D =k( r AD 2
q A
+ r BD 2
q B
+ r CD 2
q C
) =k( (0.4) 2
8×10 −9
+ 2×(0.04) 2
32×10 −9
+ (0.04) 2
24×10 −9
) =9×10 9 ×10 −9 × (0.04) 2
8 [1+ 2 4 +3] =45000×[6] =270000N/Cq A =8×10 −9 C q B =32×10 −9 C q C =24×10 −9 C Electric field intensity at D:E D = r AD 2
kq A
+ r BD 2
kq B
+ r CD 2
kq C
where r AD is the distance between A and D and so on.. E D =k( r AD 2
q A
+ r BD 2
q B
+ r CD 2
q C
) =k( (0.4) 2
8×10 −9
+ 2×(0.04) 2
32×10 −9
+ (0.04) 2
24×10 −9
) =9×10 9 ×10 −9 × (0.04) 2 8 [1+ 2 4 +3] =45000×[6] =270000N/C please mark me as the brainlest |
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