1800-150-456-789
FlagBACK
Flag Electrostatics> plese-answer...
question mark

two charges 4q and −q are placed a distance r apart.A charge Q is placed exactly mid−way between them.What willbe the value of Q so that charge 4q experiences no net force?

maniknata , 11 Years ago
Grade
anser 2 Answers
Sher Mohammad

Last Activity: 10 Years ago

first thing given charges are opposite si they will attract each other Q should be positive so it will repel 4q so force will be balanced

now 4q*Q/(r/2)^2=4q*q/r^2
=>16Q=4q
=>Q=q/4


Sher mohammad, IIT delhi
Askiitians Faculty

Faiz

Last Activity: 10 Years ago

If there is no net charge on Q (it is in equilibrium)
then the two forces should be equal in magnitude but opposite in direction.
Therefore,
4Q*q/(r/2)^2 should be 4q^2/r^2.
So, Q will be q/4. 

Provide a better Answer & Earn Cool Goodies

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Other Related Questions on electrostatics

question mark
Electrostatics question based on earthing of spherical shell
electrostatics
0 Answer Available

Last Activity: 2 Years ago

question mark
an object has a charge of 2c and gains 10^19 electrons. the net chaarge on the object becomes??
electrostatics
1 Answer Available

Last Activity: 3 Years ago

question mark
A wire with a linear charge density lambda forms a quarter of a cjrclenof radius R and is placed asa shown in thefigure with its centre of curvature at the origin O the electric field at O will be
electrostatics
0 Answer Available

Last Activity: 3 Years ago

question mark
Find the value of q so that system remains in equilibrium.. figure attached below
electrostatics
0 Answer Available

Last Activity: 3 Years ago

question mark
Find the value of q so that system remains in equilibrium
electrostatics
0 Answer Available

Last Activity: 3 Years ago