2049_ch25B - ConcepTest Two identical parallel plate...

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20 PHY2049: Chapter 25 ConcepTest Two identical parallel plate capacitors are shown in an end-view in Figure A. Each has a capacitance of C. If the two are joined together at the edges as in Figure B, forming a single capacitor, what is the final capacitance? (a) C/2 (b) C (c) 2C (d) 0 (e) Need more information A B Area is doubled
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21 PHY2049: Chapter 25 ConcepTest Each capacitor is the same in the three configurations. Which configuration has the lowest equivalent capacitance? (1) A (2) B (3) C (4) They all have identical capacitance C C C C C A B C C/2 (series)
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22 PHY2054: Chapter 16 Capacitance Example: Find Charges on Series Capacitors Let V = 10, C 1 = 6 Ж F, C 2 = 12 Ж F Find charges, voltages on C 1 , C 2 Combine series capacitances This is what battery “sees”! Find q eq , then use q eq = q 1 = q 2 q eq = C eq V = 4 x 10 = 40 Ж C Find V 1 , V 2 V 1 = q 1 / C 1 = 40 / 6 = 6.67 V V 2 = q 2 / C 2 = 40 / 12 = 3.33 V V 1 + V 2 = 10, as expected
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23 PHY2049: Chapter 25 Energy in a Capacitor Capacitors have energy associated with them Grab a charged capacitor with two hands and find out! Calculate energy Continually move charge from – to + surface dU = V dq V = q / C So capacitors store and release energy as they acquire and release charge This energy is available to drive circuits U = V dq 0 Q = q C dq 0 Q = Q 2 2 C = 1 2 CV 2
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24 PHY2049: Chapter 25 Where is the Energy Stored? Answer: Energy is stored in the electric field itself!!
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This note was uploaded on 02/28/2012 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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2049_ch25B - ConcepTest Two identical parallel plate...

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