(36) More Examples of Electric Potential and Equipotentials

# (36) More Examples of Electric Potential and Equipotentials...

This preview shows pages 1–9. Sign up to view the full content.

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

View Full Document

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

View Full Document

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

View Full Document

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.

Unformatted text preview: Lecture 36 More Example of Electric Potential. Equipotentials. Lightning rods and why you lose your radio station inside tunnels. Example: Getting the electric field from the electric potential = - r r E V ( 29 =-- +- + r ˆ ˆ ˆ 2 5 2( 4 ) E x z i j x z k We saw last time that = - + +- 2 2 ( , , ) 2 5 4 V x y z x xz y z Example: Find the electric field for = - =- 2 2 x V E x z x = - = - 5 y V E y = - = - + 2 8 z V E x z z Equipotentials for a positive point charge 30 V 20 V 10 V E Equipotentials Topographic map of Mt. Fuji Equipotentials for a positive point charge 30 V 20 V 10 V x y V 2D mapping of potential: E E X A X B Take two points A and B on an equipotential surface The electric field is always perpendicular to equipotential surfaces For any path between A and B on the surface, A B B A V V E dl- = - = v r v must be per pendicular t o E dl r r-2500-1000-500-250 500 250 1000 2500 It is actually an electric fish! The figure below looks (more or less) like the equipotentials of: A. Two identical charges B. A dipole C. Two charges of equal sign but different magnitude 100-100 ACT: Equipotentials-2500-1000-500-250 500 250 1000 2500 The electric field points in the direction of decreasing potential and is perpendicular to the equipotential surfaces: − + Black ghost knife fish This fish uses the electric field to detect approaching preys or...
View Full Document

{[ snackBarMessage ]}

### Page1 / 26

(36) More Examples of Electric Potential and Equipotentials...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online