Induced Voltage created on a loop entering a magnetic field

[allison20]

Homework Statement

A 0.69m long and 0.69m wide loop is moved at a constant velocity of 0.81m/s from a region of zero magentic field into a perpendicular constant magnetic field of 0.21T. Calculate the magnitude of the induced voltage in the loop while it is entering the B-field

Homework Equations

EMF=-N*A*B/T

The Attempt at a Solution

I can plug in the numbers for the number of loops N (1), the area A (LxW), and the magnitude of the field B (.21T), but how do I find the time from just knowing the velocity?

 

[tiny-tim]

welcome to pf!

hi allison20! welcome to pf!

EMF=-N*A*B/T

no, it's -∂/∂t (NAB)

(ie -∂/∂t (magnetic flux) )

 

[truesearch]

If you know the velocity and dimensions you should be able to calculate area swept out per second and therefore flux change per second