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Unformatted text preview: [5pt] How much energy was converted to heat in the resistor during the complete charging
The energy supplied by the battery was
heat in the resistor was so the energy converted to 4 4. [4pt] The figure shows the cross section
of a long, solid, cylindrical conductor. The
radius of the cylinder is
current of 1.31 A is uniformly distributed
(constant current density) through the
conductor and is flowing out of the page, in
direction. 1.25 A •
A Find the magnitude and direction of the
magnetic field at the three marked points.
Give the directions relative to the
coordinate system shown. • B • • C (a) [5pt] Point A at the center of the
conductor (the origin).
By Ampere’s Law, since there is no current inside a loop of zero radius, . (b) [5pt] Point B a distance of 5.00 cm from the center of the conductor along the – axis.
The field lines circulate counter-clockwise about a current pointing out of the page, so
the direction at point B will be to the right, in the
direction. The magnitude is found
using Ampere’s Law, applied to a circle of radius as shown by the dashed line added
to the figure: (c) [5pt] Point C a distance 15.0 cm from the center of the conductor along the + axis.
Applying Ampere’s Law at a radius
field lines circulate counter-clockwise, in the
current is enclosed, and using the fact that the magnetic
direction at point B, since the entire 5 5. [15pt] An unknown particle
enters the region between the two plates shown in the
figure with a speed
m/s. The potential of
the upper plate is 250 V and the bottom plate is grounded
(0V). The plate separation is
(a) [5pt] What is the magnitude and direction of the
electrical force on the particle? Use the coordinate
system shown, with the
axis out of the page, toward
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This document was uploaded on 03/09/2014 for the course PHYS 222 at Ohio Northern University.
- Spring '12