Objects? Unit 1. Investigation 2: What are the factors that affect the interaction betweens SASA SESVESNA
<3.
Safety Guide
Van de Graaff generators produce a large amount of static electricity. DO NOT touch the Van de
Graaff generator!
Explaining Franklin's Bells
Metal wire attached to
Van de Graaf generator
A Before the Van de Graaff is turned
on the ball hangs motionless
between the two cans.
Car
The four panels (A, B, C, D) of this figure
break down what is happening in four steps
as the Franklin's bells apparatus starts to
ring. Use the figure to answer Questions 2-12
Can
stars
Question #2
In panel B. what causes the ball to move toward
Can 17
R After the Van de Graaff has been
running a short time, the ball moves
toward Can 1.
Cams
Can 2
an
(rear)
C After moving toward Can 1, the ball
touches it.
Can 1
(nearl
Can 2
far
D. After touching Can 1, the ball moves
away and swings toward Can 2.
Can 1
(near
Can 2
Question #3
What is the charge on Can 1 at the moment
Shown in panel B?
A. Same as Van de Graaff
B. Opposite of Van de Graaf
C. Neutral

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?