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CBSE Class 12-science Answered

Q - 14
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Asked by majethiyarishat9566.12sdatl | 28 May, 2020, 05:12: PM
answered-by-expert Expert Answer
Two small balls having equal positive charge q Coulomb and are suspended by two insulating strings of equal length l metre. 
As the whole ste up is taken to the satellite in space there is no gravity ....(Given) 
 
Thus, mg = 0 
Thus, due to electrostatic force of repulsion, the two strings along with ball will now be in horizontal direction. 
 
 
Thus, the angle between the two strings will be 180° 
 
Now, 
the tension in each string will be equal to force of repulsion 
 
F space equals space fraction numerator k cross times q cross times q over denominator r squared end fraction H e r e comma space r space equals space 2 calligraphic l space k space equals space fraction numerator 1 over denominator 4 pi epsilon subscript 0 end fraction space F space equals space space fraction numerator 1 over denominator 4 pi epsilon subscript 0 end fraction space cross times fraction numerator q squared over denominator open parentheses 2 calligraphic l close parentheses squared space end fraction space equals space fraction numerator 1 over denominator 4 pi epsilon subscript 0 end fraction space cross times fraction numerator q squared over denominator 4 calligraphic l squared end fraction space
Answered by Shiwani Sawant | 28 May, 2020, 06:20: PM

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