Acapacitor is formed from two concentric spherical conducting shells separated by vacuum. the inner sphere has radius 10.5 cm, and the outer sphere has radius 16.5 cm. a potential difference of 150 v is applied to the capacitor. (a) what is the energy density at r = 10.6 cm, just outside the inner sphere

Explanation:

energy density can be obtained as

Where,

E is electric field

K COLOUMB CONSTANT =8.99*10^{9} N -m2 /C2

Q is charge = CV

C is capacitance =

for r  = 10.6 cm

E = 2568.34 N/C

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.