a )
given
q1 = - q2 = 520 n C
q3 = - q4 = 94 n C
a = 4.1 cm
= 0.041 m
x - component of particle 3 is Fx = F1x + F2x + F3x
due to charge q1 the horizontal force is zero
F3x = F1x + F2x + F4x
= 0 + F2 cos45 + F4x
we have basic equation F = k q1 q2 / r2
= k q2 q3 / r232 x cos45 + k q4 q3 / r342
here r23 = ( 0.0412 + 0.0412 )1/2
= 0.0578 m
F3x = k q3 ( q2 / r232 x cos45 + q4 / r342 )
= 9 x 109 x 94 x 10-9 ( 520 x 10-9 x cos45/ 0.0582 + 94 x 10-9 / 0.0412 )
F3x = 846 x 1.6522 x 10-4
F3x = 0.1397 N
b )
same way
F3y = k q3 ( q2 / r232 x sin45 - q1 / r132 )
= 9 x 109 x 94 x 10-9 ( 520 x 10-9 x sin45/ 0.0582 - 520 x 10-9 / 0.0412 )
= - 846 x 2.000354 x 10-4
F3y = - 0.16923 N
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