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Chapter 29: Q. 7 (page 830)

What currents are needed to generate the magnetic field strengths of Table 29.1 at a point1.0cmfrom a long, straight wire?

Short Answer

Expert verified

The current required 2.5A,250A,(5to50)×104A,5×105Arespectively.

Step by step solution

01

Step 1; Given information

We have given,

Different strength of the magnetic fields at a distance from the wire is 1cm.

We have to find the current required for produce the magnetic field.

02

Simplify

Since the magnetic field due to long wire is given by,

B=μ0I2πr

Where

r=0.01mμ0=4π×10-7

Then current will be

I=5×104B

Now for magnetic field of surface of earth, the current need to be

I=5×104×5×10-5I=2.5A

For Refrigerator magnetic field, the current needs

I=5×104×5×10-3I=250A

For laboratory magnet, the current need

I=5×103to5×104A

For superconducting magnet, the current required

I=5×104×10I=5×105A

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