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Chapter 29: Q. 33 (page 832)

What magnetic field strength and direction will levitate the 2.0gwire in FIGURE EX29.33?

Short Answer

Expert verified

The magnetic field in the wire is 0.13Tand it is out of the paper.

Step by step solution

01

Given information

We have given,

Current = 1.5A

Magnetic field region =10cm

We have to find the strength of magnetic field.

02

Simplify

We know the magnetic force is

F→=i(L→×B→)

To simplify it let us consider the magnetic field is out of the paper

F=iLBsin(90)0=iLBF=ILB

This force is acting upward and it is balancing the weight of the wire. then,

iLB=mg(1.5A)×(0.1m)×B=(0.002Kg)×10B=0.13T

and the direction of magnetic field is out of the paper then only the force due to magnetic field will be able to balance the weight.

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Most popular questions from this chapter

What are the strength and direction of the magnetic field at the center of the loop in FIGUREP29.43?

The toroid of figureP29.55is a coil of wire wrapped around a doughnut-shaped ring (a torus). Toroidal magnetic fields are used to confine fusion plasmas.

a. From symmetry, what must be the shape of the magnetic field in this toroid? Explain.

b. Consider a toroid with N closely spaced turns carrying current I. Use Ampère’s law to find an expression for the magnetic field strength at a point inside the torus at distance r from the axis.

c. Is a toroidal magnetic field a uniform field? Explain.

The south pole of a bar magnet is brought toward the current loop of FIGURE Q29.11. Does the bar magnet attract, repel, or have no effect on the loop? Explain.

A conducting bar of length l and mass m rests at the left end of the two frictionless rails of length d in FIGURE P29.75. A uniform magnetic field of strength B points upward.

a. In which direction, into or out of the page, will a current through the conducting bar cause the bar to experience a force

to the right?

b. Find an expression for the bar’s speed as it leaves the rails at

the right end.

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.
See all solutions

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