HW1-Ch23 - kim (hk7467) – Homework 1 (Chapter 23) –...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: kim (hk7467) – Homework 1 (Chapter 23) – kang – (GEDB023-41) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 4) 10.0 points A uniformly charged ring of radius 4 . 5 cm has a total charge of 49 μ C. The value of the Coulomb constant is 8 . 98755 × 10 9 N · m 2 / C 2 . Find the magnitude of the electric field on the axis of the ring at 1 . 2 cm from the center of the ring. Correct answer: 5 . 23154 × 10 7 N / C. Explanation: Let : a = 4 . 5 cm = 0 . 045 m , Q = 49 μ C = 4 . 9 × 10- 5 C , k e = 8 . 98755 × 10 9 N · m 2 / C 2 , and x = 1 . 2 cm = 0 . 012 m . The electric field is E = k e xQ ( x 2 + a 2 ) 3 / 2 = (8 . 98755 × 10 9 N · m 2 / C 2 ) (0 . 012 m) (0 . 012 m 2 + 0 . 045 m 2 ) 3 / 2 × (4 . 9 × 10- 5 C) = 5 . 23154 × 10 7 N / C . 002 (part 2 of 4) 10.0 points Find the magnitude of the electric field on the axis of the ring at 4 . 72 cm from the center of the ring. Correct answer: 7 . 49481 × 10 7 N / C. Explanation: Let : x = 4 . 72 cm = 0 . 0472 m . E = (8 . 98755 × 10 9 N · m 2 / C 2 ) (0 . 0472 m) (0 . 0472 m 2 + 0 . 045 m 2 ) 3 / 2 × (4 . 9 × 10- 5 C) = 7 . 49481 × 10 7 N / C . 003 (part 3 of 4) 10.0 points Find the magnitude of the electric field on the axis of the ring at 44 cm from the center of the ring. Correct answer: 2 . 23951 × 10 6 N / C. Explanation: Given : x = 44 cm = 0 . 44 m . E = (8 . 98755 × 10 9 N · m 2 / C 2 ) (0 . 44 m) (0 . 44 m 2 + 0 . 045 m 2 ) 3 / 2 × (4 . 9 × 10- 5 C) = 2 . 23951 × 10 6 N / C ....
View Full Document

This note was uploaded on 12/05/2010 for the course PHY 303 taught by Professor Kang during the Fall '10 term at Sungkyunkwan.

Page1 / 5

HW1-Ch23 - kim (hk7467) – Homework 1 (Chapter 23) –...

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

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