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Two point charges q_A =3 mu C and q_B = -3muCare located 20 cm apart in vacuum. What is the electric field at themidpoint O of the line AB joining the two charges? If a negative test charges of magnitude1.5 xx 10^(-9)C(##U_LIK_SP_PHY_XII_C01_E01_008_Q01.png" width="80%"> |
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Answer» Solution :Here ` q_A =3 mu C = 3xx 10 ^(-6)C, q_B =-3mu C` `= -3 xx 10 ^(-6) C,AB =20 cm = 0.2 m and AO =OB = ` ` therefore "" oversetto (E_O)=oversetto (E_A) + oversetto (E_B)=9xx 10 ^(9)[( 3xx10 ^(-6) )/( (0.1)^(2) ) +(3xx10 ^(-6))/( (0.1)^(2)) ]` along OB `= 5.4 xx 10 ^(6)NC^(-1)` along OB Whena CHARGES ` q_0 =-1.5 xx10 ^(-9)C ` is placed at point O,then ` oversetto (F_O) =q_0 oversetto (E_O)= ( - 1.5 xx 10^(-9))xx 5.4 xx10 ^(6)` ` =- 8.1 xx 10 ^(-3)N ` alongOB `=8.1 xx 10 ^(-3)N ` along OA. |
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