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Chapter 29: Q. 5 (page 829)

What is the current direction in the wire of FIGURE Q29.5? Explain.

Short Answer

Expert verified

The current direction will be downward.

Step by step solution

01

Given information

We have given,

a current carrying wire producing the magnetic field around it.

We have to find the direction of current in wire.

02

Simplify

From the diagram, here the cross sign indicates the magnetic field inward the paper and the dot sign indicts the magnetic field outward the paper.

Now by using right hand thumb rule curl the field in the direction of magnetic field and the thumb will show the direction of current which is downward.

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Most popular questions from this chapter

A non-uniform magnetic field exerts a net force on a current loop of radius R. FIGURE P29.78 shows a magnetic field that is diverging from the end of a bar magnet. The magnetic field at the position of the current loop makes an angle u with respect to the vertical. a. Find an expression for the net magnetic force on the current. b. Calculate the force if R = 2.0 cm, I = 0.50 A, B = 200 mT, and u = 20掳.

The coaxial cable shown in FIGURE P29.56 consists of a solid inner conductor of radius R1surrounded by a hollow, very thin outer conductor of radius R2. The two carry equal currents I, but in opposite directions. The current density is uniformly distributed over each conductor.

a. Find expressions for three magnetic fields: within the inner conductor, in the space between the conductors, and outside the outer conductor.

b. Draw a graph of B versus r from r=0to r=2R2if R1=13R2.

A small bar magnet experiences a0.020Nmtorque when the axis of the magnet is at 45掳to a 0.10Tmagnetic field. What is the magnitude of its magnetic dipole moment?

What is the magnetic field strength at the center of the semicircle in figureP29.54?

A long, straight conducting wire of radius R has a nonuniform current density J=J0rR, where J0is a constant. The wire carries total current I.

a. Find an expression for J0in terms of I and R.

b. Find an expression for the magnetic field strength inside the wire at radius r.

c. At the boundary, r = R, does your solution match the known field outside a long, straight current-carrying wire?
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