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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)脳104A,5脳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=渭0I2蟺谤

Where

r=0.01m渭0=4蟺脳10-7

Then current will be

I=5脳104B

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

I=5脳104脳5脳10-5I=2.5A

For Refrigerator magnetic field, the current needs

I=5脳104脳5脳10-3I=250A

For laboratory magnet, the current need

I=5脳103to5脳104A

For superconducting magnet, the current required

I=5脳104脳10I=5脳105A

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