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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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Most popular questions from this chapter

What is the net force (magnitude and direction) on each wire in n FIGURE EX29.36?

What is the line integral of B鈫�between points i and f in FIG URE EX29.24?

The wire is broken on the right side of the circuit in FIGURE Q28.3. What is the potential difference V1-V2between points 1and2? Explain.

FIGURE EX29.37 is a cross-section through three long wires with a linear mass density 50g/m. They each carry equal currents in the directions shown. The lower two wires are 4.0cmapart and are attached to a table. What current I will allow the upper wire to 鈥渇loat鈥� so as to form an equilateral triangle with the lower wires?

Point A in FIGURE EX29.15 is 2.0mmfrom the wire. What is the magnetic field strength at point A? You can assume that the wire is very long and that all other wires are too far away to contribute to the magnetic field.
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