Exercise 120519

Problem 1

In a circular region, there is a uniform magnetic field ${\vec {B}}$ pointing into the page. An xy coordinate system has its origin at the circular region’s center. A free positive point charge $Q=+1.0\mu$C is initially at rest at a position $x=+10$ cm on the x axis. If the magnitude of the magnetic field is now decreased at a rate of $-0.10$ T/s, what force (magnitude and direction) will act on $+Q$?