Lecture_5

Lecture_5 - Lecture 5-1 Lecture Physics 219 Question 1...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 5 Lecture 5 -1 A charge of Q is placed on the inner ball. What is the total charge induced on the inside surface of the outer shell? a) 0 b) Q c) - Q d) - Q/2 e) depends on the net charge on the outer shell Physics 219 – Question 1 – January 26, 2011
Background image of page 1

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

View Full DocumentRight Arrow Icon
Lecture 5 Lecture 5 -2 Electric Current Current = charges in motion ( ) 0 lim t q I t Δ→ Δ Δ Magnitude rate at which net positive charges move across a cross sectional surface Units: [I] = C/s = A (ampere) Current is a scalar, signed quantity, whose sign corresponds to the direction of motion of net positive charges by convention
Background image of page 2
Lecture 5 Lecture 5 -3 Electric Current and Human Body Current flowing through your body: ± disrupts muscle (including the heart) ± interferes with the nervous system. 1 mA can be felt 5 mA painful, but no damage 10 mA involuntary muscle contractions, 15 mA paralysis 70 mA lethal if pass through heart for more than 1 sec 100-300 mA ventricular fibrillation (heart trouble!!), death A defibrillator sends a brief current of several Amps near the heart, which causes the heart to suddenly contract, after which it may return to normal operation.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Lecture 5 Lecture 5 -4
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/23/2011 for the course PHYS 219 taught by Professor Staff during the Spring '08 term at Purdue.

Page1 / 17

Lecture_5 - Lecture 5-1 Lecture Physics 219 Question 1...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online