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Question

Two charges 5μC and 20μC are placed 30 cm apart. Find the strength of electric field at the mid point between them.

Solution
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Let "O" be the midpoint between the charges Q1andQ2.
The strength of electric field at the point 'O' due to Q1 is.
E1=14πϵ0Q1d21
=9×109×5×106(0.15)2
=2×106N
The strength of electric field at the point 'O' due to Q1 is,
E2=14πϵ0Q2d22=9×109×20×106(0.15)2
=8×106N
Total strength of electric field at the point 'O' s E=E1+E2
=2×106+8×106=[2+8]106=107N
823690_93974_ans_3b948211ce91421ca5fa6b8549112bd5.png

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