ANSWER IS 12.5 . please explain

Please anyone reply me

Are YAAr germany have Ballack. klose.Podolski, frings and of course lehmann.

Now start voting................

Who will win today.Germany or portugal

Myself Germany means votes are 1-0

A charge of +2.0 x 10^-8 C is placed on the positive plate and a charge of -1.0 x 10^-8 C on the negative plate of a parallel -  plate capacitor of capacitance 1.2 x 10^-3 F.Calculate the potential difference developed between the plates.

 (         )

where ( . ) denoted gretest integer fraction.

If x^y=e^x-y , prove that dy/dx=logx / (1+logx)²

 But answer is sigma / 4apsilon not

Two small equal spheres carrying unlike and unequal charges are placed 8 cm apart and attract each other with a force of 4 x 10^-5 N.After they have

been connected for a moment by a thin conducting wire , they repel each

other with a force of 2 x 10^-5 N.Calculate their original charges.

Find the electric field and potential at the center of a hemisphere of radiusR 

charged uniformly with a charge of surface density sigma?

Two charges of +4 x 10^-7 C and -8 x 10^-7 C are 20 cm apart.Find the

resultant intensity at a point P situated 20 cm from either charge.

Two charges spheres have equal energy.Compare their radius if they have charges 400 and 200 units.

What is the cost of M.L.Khanna

Any one please reply me.