Physics 202 & 214 Quiz # 25 March 12, 2008

Phy 202 Quiz 25

1. A wire with a mass of 1.00 g/cm is placed on a horizontal surface with a kinetic coefficient of friction of 0.200. The wire carries a current of 1.50 A eastward and slides horizontally to the north with constant speed. What are the magnitude and the direction of the smallest vertical magnetic field that enables the wire to move in this fashion?

Phy 214 Quiz 25

A conductor in the shape of a square loop of edge length l = 0.400 m carries a current I = 10.0 A as in Fig. P30.3.

1. To calculate the magnitude and direction of the magnetic field at the center of the square, which formula for magnetic field must be used and how do you know?

2. What is the answer to the question?

5 pts bonus: What If? If this conductor is formed into a single circular turn and carries the same current, what is the value of the magnetic field at the center?