IIT JEE Advanced 2011 Paper 2

Section: Physics

Question : 7 of 60

Marks: +1, -0

A long insulated copper wire is closely wound as a spiral of N turns. The spiral has inner radius a and outer radius b. The spiral lies in the xy-plane and a steady current I flows through the wire. The z-component of the magnetic field at the centre of the spiral is

[JEE Adv 2011 P2]

µ0NI
2(b−a)
‌ln(
b
a
)
µ0NI
2(b−a)
‌ln(
b+a
b−a
)
µ0NI
2
‌ln(
b
a
)
µ0NI
2b
‌ln(
b+a
b−a
)

Validate

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