SATHEE: Electrostatics Question 587

Electrostatics Question 587

Question: Three plates $A, B, C$ each of area $50 c m^{2}$ have separation $3 m m$ between $A$ and $B$ and $3 m m$ between $B$ and $C$ The energy stored when the plates are fully charged is [SCRA 1996]

Options:

A) $1.6 \times 10^{- 9} J$

B) $2.1 \times 10^{- 9} J$

C) $5 \times 10^{- 9} J$

D) $7 \times 10^{- 9} J$

Show Answer

Answer:

Correct Answer: B

Solution:

There are two capacitors parallel to each other.

Total capacitance $= \frac{2 ε_{0} A}{d}$

Energy stored $= \frac{1}{2} (\frac{2 ε_{0} A}{d}) V^{2}$

$= \frac{8.86 \times 10^{- 12} \times 50 \times 10^{- 4} \times 12^{2}}{3 \times 10^{- 3}} = 2.1 \times 10^{- 9} J$

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Electrostatics Question 587

Question: Three platesA, B, C each of area 50cm2 have separation 3mm between A and B and 3mm between B and C The energy stored when the plates are fully charged is [SCRA 1996]

Options:

Answer:

Solution:

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Question: Three plates $A, B, C$ each of area $50 c m^{2}$ have separation $3 m m$ between $A$ and $B$ and $3 m m$ between $B$ and $C$ The energy stored when the plates are fully charged is [SCRA 1996]