Magnetic Force and electric forces Between two Moving Charges
Suppose two charges q1 and q2 are moving with
velocities v1 and v2 respectively.Let r be the distance
between the particles at any instant.
Two forces would be acting on each charges at this particular instant
Motivating Yourself to Study
1) Remind Yourself of Your Purpose - What are your goals in life? Where do
you see yourself 5, 15, or even 25 years down the road? .Objectives and aims
are one of the best sources of motivation, as they will keep you focused and
enable you to “do whatever it takes” to accomplish your goals. The
time that you spend studying now will help to make your future dreams and
aspirations a reality.
Four kinds of Force
There are at present four basic forces known to physics. Here is the list of
them in order of decreasing strength
a) Strong
b) electromagnetic
c) Weak
d) Gravtitional
Time management tips for students
1) Prepare a Schedule/Calendar for the studies.You only have 24 hours a day,
168 hours a week . Effective study time management means that you use your
given time in the most efficient way. Therefore it is important to prepare a
regularly updated schedule/calendar, where you:
a) write down all your scheduled tests
b) write down all tasks, assignments and duties,
c) record your planned leisure-activities, such as gym, etc.
d) Write an ordered list of what you need to get done.Prioritize the items
on your list.
Electro Magnetism and Relatively
Magnetic Force on the charged particles is given by
F=qvXB
Where v is the velocity which is frame dependent.So different observer will
calculate different Magnetic Force
Or
A charge at rest produces no magnetic field but a moving charge produces a
magnetic field. Again moving charge depends on frame of refrence
Excel in IITJEE
1) Read each question carefully and give it your best try.If you get it,
it's great. If not, move on to the next. Do not stick to it just because it is
from your strong topic.
2) Keep simultaneously marking the answers in the answer sheet so as to
aviod any mistake at the end
3)Each question should be attempted with a fresh mind-set. You should not
lose out a question just because the earlier question was not solved.
Different type of Force and their origin
A) Normal Force: When we put a book on a table ,the molecules of the book exert downward forces on the molecules of the table.The molecules composing the upper layer of the tabletop move downward until the repulsion of the molecules below balances the forces applied by the book.
This compression always occur but it is too slight to notice
The following things are good to notice about normal force
Difference between conservative and Non conservative forces
1) Potential energy are defined for Conservative forces
2) An object that starts at a given point and return to the same point,then net workdone by the conservative force is zero
while in case of non conservative force ,it will not be zero
Fictitous Force and Free falling Elevator
A non inertial Frame of Refrence is the frame of refrence which is having
acceleration(a0) Example Free Falling elevator
Newtons law are valid in inertial frame of refrence only. We cannot apply
them as it is in non inertial frame of refrence as it left out the acceleration
of the object because of the frame of refrence.
Let me provide simple example to illustrate this.
Acceleration in a plane
The acceleration vector has the same direction as instantanous change in velocity. Since the direction of the velocity changes
in the direction in which the curve bends ,the acceleration is always pointing
towards concavity of the curve
Galilean Transformation
Motion is a relative concept . You are sitting on a train. A object on
trains seems to be at rest from your perspective but it is in motion from the
person standing on the ground.So it is tied to particular frame of refrence
choosen by observer.
What are black holes?
According to special theory of relativity, the maximum velocity that can
exist is the velocity of light
c=3X108 m/s
Differentiation of Vector Product
Now There are two type of vector Products
a) Cross product
b) Dot product
