(^96) Aptitude Test Problems in Physics
How will it move and where will it be
in time t after the beginning of motion?
3.55. A long cylindrical coil of inductance
Li is wound on a bobbin of diameter D 1.
The magnetic induction in the coil connect-
ed to a current source is B^1. After rewind-
ing the coil on a bobbin of diameter D 2 ,
its inductance becomes L2.
Determine the magnetic induction B2
of the field in the new coil connected to the
same current source, assuming that the
length of the wire is much larger than that
of the coil.
3.56*. Two long cylindrical coils with uni-
form windings of the same length and nearly
the same radius have inductances L 1 and
L 2. The coils are coaxially inserted into
each other and connected to a current source
as shown in Fig. 110. The directions of
the current in the circuit and in the turns
are shown by arrows.
Determine the inductance L of such a
composite coil.
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