Question

can someone help me solve this ?​

Answer 1

Answer:

decreases by 6.25%

Explanation:

Q1 = +Q ; Q2 = -Q ; distance = r

F1 = - K Q1 Q2 / r^2,.........(1)

now....25% of Q1 transferred to Q2.... then...

Q1 = +75/100Q ; Q2 = -125/100Q ; distance = r

F2 = - 75 × 125 × Q1 Q2 / ( 100 × 100 ) r^2......(2)

F2 / F1 = 75 × 125 ( 100 × 100 ) = 15/16

F2 = ( F1) 15/16

F2 - F1 = - F1/16

( F2 - F1 ) × 100 / F1 = - 100/16% = - 6.25%

hence the force decreases by 6.25%