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KCET 2021 Physics Solved Paper
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© examsnet.com
Question : 56
Total: 60
A toroid with thick windings of N turns has inner and outer radii
R
1
and
R
2
, respectively. If it carries certain steady current I, the variation of the magnetic field due to the toroid with radial distance is correctly graphed in
Validate
Solution:
Magnetic field due to toroid can be given as
(i) In the open space, exterior of a toroid,
B
=
0
(ii) Inside the toroid,
B
=
µ
0
NI
2
π
T
Here,
r
=
R
1
+
R
2
2
⇒
B
=
µ
0
NI
π
(
R
1
+
R
2
)
=
constant
So, the variations of
B
with
r
is correctly depicted in option
(
d
)
.
© examsnet.com
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