A tightly wound, long solenoid is kept with its axis parallel to a large metal sheet carrying a surface curr
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B
a
×ℓ=μkℓ ⇒B
a
=μ
0
kBC=μ
0
k
B=
B
a
2
+B
c
2
=
2(μ
0
k)
2
=
2
μ
0
k
2μ
0
k=μ
0
ni
i=
n
2
k
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Answer:
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