The parallel plates in a capacitor, with a plate area of 7.10 cm2 and an air-filled separation of 2.20 mm, are charged by a 4.80 V battery. They are then disconnected from the battery and pulled apart (without discharge) to a separation of 6.50 mm. Neglecting fringing, find (a) the potential difference between the plates, (b) the initial stored energy, (c) the final stored energy, and (d) the work required to separate the plates.

a)14.17V

b)32.8 x J

c)96.9x J

d) -64x J

Explanation:

Given:

Area 'A'=7.10cm² =>7.1 x m²

voltage ''=4.8 volt

= 2.20mm => 2.2 x m

= 6.50mm => 6.5 x m

a) Capacitance before push is given by:

= εA/ =>

=   2.85 x F

==> 2.85 x x 4.8

=1.37 x C

Capacitance after push is given by:

= εA/ =>

=   9.66 x F

=

=

Therefore, the potential difference between the plates

= 1.37 x / 9.66 x =>14.17V

b)

32.8 x J

c)

= 96.9x J

d) the work required to separate the plates is given by:

workdone=  -=> 32.8 x J- 96.9x J

W≈ -64x J

b

step-by-step explanation: a third of 24 is 8, 8 times 3 is 24 so 8 - 2 would be 6

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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