What is the potential difference between points a and b?

[shimizua]

Homework Statement

A 1000-turn loop (radius = 0.037m) of wire is connected to a (20 Ohm) resistor as shown in the figure. A magnetic field is directed perpendicular to the plane of the loop. The field points into the paper and has a magnitude that varies in time as B=gt, where g=0.25 T/s. Neglect the resistance of the wire.
http://capa-new.colorado.edu/msuphysicslib/Graphics/Gtype64/prob03a_cj22.26.gif

What is the magnitude of the potential difference between points a and b?

Homework Equations

equation is E = -NA ((dB(t))/dt) but how do u find what t and what is B(t)?

The Attempt at a Solution

cant attempt cause i don't know what t and B(t) are

PLEASE HELP!

 

[rock.freak667]

You were give B=gt. You have the value of 'g'. I think you can easily find dB/dt.

 

[shimizua]

ok well i don't remember how to find B with what is given to me. sorry. if you can just give me some equations i can do the work. not asking for u to do the work for me

 

[rock.freak667]

ok well i don't remember how to find B with what is given to me. sorry. if you can just give me some equations i can do the work. not asking for u to do the work for me

The field points into the paper and has a magnitude that varies in time as B=gt, where g=0.25 T/s.

B=gt...dB/dt

B=0.25t...dB/dt = ?


B=t²,dB/dt = 2t