Question

1. If q, + 92 = 9, then the force between q, and q, is maximum when q/q, is (1) O ( (2) 2 (4) 3 (3) 1 dinofc ?​

Answer 1

Answer:

F=

r

2

Kq

1

q

2

⟹F=

r

2

Kq

1

(q−q

1

)

Differentiating both sides with respect to q

1

−

r

2

K

(q−2q

1

)=

dq

1

dF

For, force to be maximum,

dq

1

dF

=0

⟹q−2q

1

=0

⟹q

1

=

2

q

q

2

=q−q

1

=

2

q

Hence,

q

2

q

1

=1