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JEEMAIN and NEET
>>
Physics
>>
Class12
>>
Magnetism and Matter
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Q)
A rigid circular loop of radius
r
lies in the
x
−
y
plane on a flat table and a current
i
flows through it. At this place, the earth’s magnetic field is
B
x
ˆ
i
+
B
z
ˆ
k
. The value of
i
so that one end of the loop lifts up from the table is
(
a
)
m
g
π
r
√
B
x
2
+
B
z
2
(
b
)
m
g
π
r
B
x
(
c
)
m
g
π
r
B
z
(
d
)
m
g
π
r
√
B
x
.
B
Z
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