Physics 2102 Section 001 Schafer March 20, 2009.
Activity 1: Do this as soon as you sit down!
The figure shows two circuits in which a conducting bar is slid at the same speed v through the same
uniform magnetic field, along a set of rails. The length of the bar is 2L in circuit 1 and L in circuit 2.
The current induced in circuit 1 is counter-clockwise.
(a) Is the direction of the magnetic field into or out of the page?
(b) Is the direction of the current induced in circuit 2 clockwise or counterclockwise?
(c) Is the emf induced in circuit 1 larger than, smaller than, or the same as that in circuit 2?
Activity 2:
The figure on the left shows the variation with time of the potential difference VR across a resistor in
three circuits wired as shown in the figure on the right. The circuits contain the same resistance R and
emf E but different inductance L. Rank the circuits according to the value of L, greatest first.
