PHYS_41_-_Exam_2_Make-Up

# PHYS_41_-_Exam_2_Make-Up - Physics 41 Fall 2009 Conceptual:...

This preview shows pages 1–2. Sign up to view the full content.

Physics 41 Exam 2 Make-Up ~W(/6"f"U?K?5 Fall 2009 Conceptual: 1. The capacitance of a system depends only on the geometry of the conductors. •—v /* f\ £~ /I o r ^v T* i L* rl I *^ » -i.^ - t? / ^ Lrue)or False j' *-" ~ " / T* r 2. A capacitor C vi has a charge Q". The actual charges on its plates are: a) Q,Q /0 b) Q/2,Q/2 C = jt d) Q/2,-Q/2 ^ e) Q,0 3. If the potential difference across a single capacitor is doubled, by what factor does the stored energy in the capacitor change? a) the energy remains the same - -,-r b) the new energy is twice the original U. 6 = J- C.v 0 •=? \A.£ ~ -i ^ -f c) the new energy is three times the original the new energy is four times the original \A r. ~ e) the new energy is eight times the original -ir a) none of the above (J( » - 4 ( {C /^^f Lf £ 4. If the space between the plates of a capacitor is completely filled with a dielectric material, the capacitance C is increased by a factor K, called the dielectric constant. False 5. The average drift speed of electrons moving in a wire when the wire is hooked up to a voltage source such as a car battery is very close to the speed of light, Trueorate v ^ 6. Which process will double the power given off by a resistor? a) doubling the current while doubling the resistance (b)) doubling the current by making a resistance half as big 2,P - - C»r c) doubling the current by doubling the voltage

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 08/30/2010 for the course PHYS 230 taught by Professor Whielhelm during the Spring '10 term at Diablo Valley College.

### Page1 / 8

PHYS_41_-_Exam_2_Make-Up - Physics 41 Fall 2009 Conceptual:...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online