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A rectangular loop of N closely packed turns is positioned near a long straight wire as shown in Figure. What is the mutual inductance M for the loop–wire combination if N=100,a=1.0cm,b=8.0cm,andl=30cm

Short Answer

Expert verified

Mutual Inductance M for the loop – wire combination will be1.32×10-5H

Step by step solution

01

Given

N=100a=1.0cm=0.01mb=8.0cm=0.08ml=30cm=0.3m

02

Understanding the concept

We know the formula for the magnetic flux in terms of the magnetic field. We also have the formula for the mutual inductance in terms of the magnetic flux. So, we can calculate the required answer using the given information.

Formula:

Ï•=∫BdAB=μ0I2Ï€°ùM=NÏ•I

03

Calculate mutual Inductance M for the loop – wire combination

We have,

ϕ=∫BdA

Magnetic flux through the loop can be written as,

Ï•B=∫aa+bBwire×ldrÏ•B=∫aa+bμ0I2Ï€°ù×ldrÏ•B=μ0Il2π∫aa+b1rdrÏ•B=μ0Il2Ï€Inraa+bÏ•B=μ0Il2Ï€(ln(a+b)-lna)Ï•B=μ0Il2π×In1+ba

We know that,

M=NϕIM=NI×μ0Il2π×In1+baM=Nμ0I2π×In1+0.080.01M=1.32×10-5H

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