)
produce a magnetic field 
such
that
(a) 
(b)
(c)
it obeys inverse cube law
(d)
it is along the line joining the electron and point of observation
Answer:
(a)According to Biot
Savart's law, the magnetic field 
at a
point distance r from a charge q moving with a velocity 
is given by,
The
direction of is along 
, i.e., perpendicular to the
plane containing 
and 
. 
at a point obeys inverse
square law and not inverse cube law.
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