Two point charges are placed on \( x \)-axis as shown. \( a=1 \mathrm{~cm} \), \( q=1 \mu \mathr...

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Two point charges are placed on \( x \)-axis as shown. \( a=1 \mathrm{~cm} \), \( q=1 \mu \mathrm{C} \), mass of each particle \( m=6 \mathrm{~g} \). The charges are tied at of length \( 2 a \). The whole system is free to move on a horizontal frictionless surface. What is the tension in the string?
(1) \( 11.25 \mathrm{~N} \)
(2) \( 22.5 \mathrm{~N} \)
(3) \( 45 \mathrm{~N} \)
(4) \( 90 \mathrm{~N} \)
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