Ans: It is given that:
Net outward flux through surface of the box, 
.
For a body containing net charge a, flux is given by 
where,
Permittivity of free space 
Therefore, the charge 
is given by 
.
![\[\begin{array}{l} \Rightarrow \mathrm{q}=8.854 \times 10^{-12} \times 8.0 \times 10^{3} \\ \Rightarrow \mathrm{q}=7.08 \times 10^{-8} \\ \Rightarrow \mathrm{q}=0.07 \mu \mathrm{C} \end{array}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-dbc6fd95b0011f1bcdbfe7d9545fd392_l3.png "Rendered by QuickLaTeX.com")
Careful measurement of the electric field at the surface of a black box indicate that the net outward flux through the surface of the box is 
a) What is the net charge inside the box?
a) What is the net charge inside the box?Careful measurement of the electric field at the surface of a black box indicate that the net outward flux through the surface of the box is a) What is the net charge inside the box?
a) What is the net charge inside the box?
.
)
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 
carrying currents of 
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.