Homework Statement
A biology student wishes to examine a bug at a magnificaiton of +5.00 by looking through a single lens. the student wants the image of the bug to be a distance of 25cm from the lens. what is the focal length of the lens?
Answer:+6.25cm
Homework Equations...
Homework Statement
Charge of uniform density 4.50nC/m is distributed along the circle of radius R. What is the electrical potential (relative to zero at infinity) at the centre of the circle?
Answer: 254V
Homework Equations
electric potential: V=kQ/r
The Attempt at a Solution
Because the...
Homework Statement
A proton moves in a constant electric field E from point A to point B. the magnitude of the electric field is 6.4x10^4 N/C. The direction of electric field is opposite to the motion of the proton.
If the distance from point A to point B is 0.50m, what is the change in the...