A long insulated copper wire is closely wound as a spiral of 10 turns, the spiral has inner radius 20 cm & outer radius 25 cm. The spiral lies in the xy− plane, & a steady current 2 A flows through the wire. The z−component of the magnetic field at the centre of the spiral is(Take ln(1.25)=0.223)

A long insulated copper wire is closely wound as a spiral of 10 turns,

1.	A long insulated copper wire is closely wound as a spiral of 10 turns, the spiral has inner radius 20 cm & outer radius 25 cm. The spiral lies in the xy− plane, & a steady current 2 A flows through the wire. The z−component of the magnetic field at the centre of the spiral is(Take ln(1.25)=0.223)
Answer» A long insulated copper wire is closely wound as a spiral of $10$ turns, the spiral has inner radius $20 cm$ & outer radius $25 cm$ . The spiral lies in the $x y -$ plane, & a steady current $2 A$ flows through the wire. The $z -$ component of the magnetic field at the centre of the spiral is (Take $ln (1.25) = 0.223$ )

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