Ans: Point 
are at the same distance from the point 
.
Hence,
What is the work done in moving a 
point change from corner 
to corner 
of a square 
when a 
charge exists at the centre of the square?
point change from corner to corner of a square when a charge exists at the centre of the square?What is the work done in moving a point change from corner to corner of a square when a charge exists at the centre of the square?
point change from corner to corner of a square when a charge exists at the centre of the square?
.
)
west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be 
Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points 
and 
in the same direction are separated by a distance of 
. Estimate the force on a 
section of wire A.
wire carrying a current of 
is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 
. What is the magnetic force on the wire?
and making an angle of 
with the direction of a uniform magnetic field of 
. What is the magnitude of the field 
at a point 
from the wire?
-turns carrying current 
.
is at distance 
from the wire. Find the force acting on the electron if its velocity is directed towards the wire.