Date: April 2014.
Quiz # 3.
Q 1.(a) An electron moving perpendicular to a magnetic field of 4.6 x 10-3 T, moves in a circular
path of radius 2.8 mm. Calculate electrons' speed. How does it compare with the speed of ligh
A freely suspended magnet always points N-S
Poles of a magnet are the ends where objects Iron
pieces are most strongly attracted.
Two poles, called north and south
Like poles repel each other and unlike poles attract
Nature of Light
Light travels in a straight line from
its source with constant speed c
From experiments c = 3 x 108 m/s
in free space.
Newtons corpuscular theory said
light consists of massless particles
witch move in a strai
Lenses & Mirrors
Properties of the image can be
determined by geometry.
One ray starts at P, follows
path PQ and reflects back on
A second ray follows path PR
and reflects according to the
Law of Reflection.
The image i
Invented electric motor,
Discovered laws of
Faradays Experiment Set Up
A current can be produced
by a chang
Rate of flow of electric
charge is known as electric
SI units: 1C/1Sec = 1Amp.
Direction of the flow of the
In metals electrons flow.
Opposite to electron flow
direction is the
Electrical potential energy. U
Electrical potential energy is assigned to a system, in which two or
more charges interact with each other.
Consider two positive charges q & interacting with each other at
infinity and a distance d.
Like Charges Repel
Conductors & Insulators
materials in which the
electric charges move
Copper, aluminum and
silver are good
When a conductor is
Date: Feb, 2015 Physics 205 Sec.
Quiz # 2. Student# Name ’
A parallel-plate capacitor has dimensions 4.0 cm x 5.0 cm. The plates are separated by a 1.0-mm
thickness of paper. If capacitor stores a charge of 9.8 x 10—]1 C, when connected to a 1.5—V.
Physics 205 See.
Date: Feb. 2015
Quiz # 1.
(a) Three charges, each equal to 2.9 IlC are placed at three corners of a square 0.5 m on \ ne
side, see diagram. Find force on charge q,
~ I ;=