Two 4.0-cm-diameter aluminum electrodes are spaced 0.50 mm apart. the electrodes are connected to a 100 v battery. part a what is the capacitance?

Capacitance, is the ability of a system to store the electric charge. the capacitance of two 4.0-cm-diameter aluminum electrodes are spaced 0.50 mm apart is .

The capacitance of a parallel-plate capacitor in vacuum,

Where,

A - Area of plate  =

d - distance between plate = 4 cm

- electric permittivity -  

Put the values in the formula,

Therefore the capacitance of two 4.0-cm-diameter aluminum electrodes are spaced 0.50 mm apart is .

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the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form