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प्रश्न
A capacitor is charged by a battery and energy stored is 'U'. Now the battery is removed and the distance between plates is increased to four times. The energy stored becomes ______.
पर्याय
3U
2U
U
4U
MCQ
रिकाम्या जागा भरा
उत्तर
A capacitor is charged by a battery and energy stored is 'U'. Now the battery is removed and the distance between plates is increased to four times. The energy stored becomes 4U.
Explanation:
Energy stored `"w"="Q"^2/"2C"`
`"C"=(in_0"A")/"d"`
If d is increased four times, the capacitance becomes one fourth. The charge Q remains same. Hence the energy stored becomes four times.
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