fl 4final.pdf-f14 e) AP Physics 1 and practice-exams-... [Software Updater] Scre

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fl 4final.pdf-f14 e) AP Physics 1 and practice-exams-... [Software Updater] Screenshot Screenshot Screenshot f14final.pdf f14final File Edit View Go Bookmarks Help 198.7596 a) An ideal LC circuit has 8 J of energy stored in the capacitor and 10 J of energy stored in the inductor at time t = O. The capacitance of the circuit is C-3 F, and the inductance is L = 4 H. As time goes on, what is the maximum current in the circuit? b) Describe Lens, law ( =-d@B/dt) in words. What is the significance of the minus sign? Mozilla Firefox seems slow to start. Learn How to Speed It Up Don't Tell Me Again x

Explanation / Answer

maximum energy across the indutor = 8 J + 10 J = 18 J

inductance = L = 4 H

the energy stored in inductor is given as ::

E = (0.5) L i2

18 = (0.5) (4) i2

i = 3 A

b)

Lens's law :: according to lenz's law, the polarity of the induced emf is such that it opposes the change in magnetic flux resposible for its production.

negative sign indicates that induced emf opposes the change in magnetic flux.

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