Five long wires A, B, C, D and E, each carrying current I are arranged

1.	Five long wires A, B, C, D and E, each carrying current I are arranged to form edges of a pentagonal prism as shown in Fig. 4.6. Each carries current out of the plane of paper.(a) What will be magnetic induction at a point on the axis O? Axis is at a distance R from each wire.(b) What will be the field if current in one of the wires (say A) is switched off?(c) What if current in one of the wire (say) A is reversed?
Answer» (a) zero (b) μ₀/2π i/R perpendicular to AO towards left. (c) μ₀/π i/R perpendicular to AO towards left.

Five long wires A, B, C, D and E, each carrying current I are arranged to form edges of a pentagonal prism as shown in Fig. 4.6. Each carries current out of the plane of paper.(a) What will be magnetic induction at a point on the axis O? Axis is at a distance R from each wire.(b) What will be the field if current in one of the wires (say A) is switched off?(c) What if current in one of the wire (say) A is reversed?

Answer»

(a) zero

(b) μ₀/2π i/R perpendicular to AO towards left.