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College Physics (Urone)
Found in: Page 812
College Physics (Urone)

College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

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Short Answer

What is the direction of a current that experiences the magnetic force shown in each of the three cases in Figure22.54, assuming the current runs perpendicular to B?

(a) The current will be flowing to the left (west).

(b) The current will be flowing out of the page.

(c) The current will flow in an upward direction (north).

See the step by step solution

Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Step 1: Concept Introduction

The magnetic impact on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. In a magnetic field, a moving charge experiences a force that is perpendicular to both its velocity and the magnetic field.

Step 2: The Direction of a Current

The right-hand rule will be used to identify the current direction.

The palm will be aligned with the force direction, the fingers will be aligned with the field direction, and then the thumb will be pointing in the direction of the current.

(a)

The current will point to the left or in the west direction if the force is pointing upwards and the field is pointing outwards.

(b)

The current will point out of the page if the force is directed upwards and the field is pointed to the right.

(c)

The current will be pointing upwards since the force is directed to the right and the field is pointing into the page.

Most popular questions for Physics Textbooks

Suppose two long straight wires run perpendicular to one another without touching. Does one exert a net force on the other? If so, what is its direction? Does one exert a net torque on the other? If so, what is its direction? Justify your responses by using the right hand rules.

What is the direction of the magnetic field that produces the magnetic force on a positive charge as shown in each of the three cases in the figure below, assuming B is perpendicular to v?

A surveyor \({\rm{100 m}}\) from a long straight \({\rm{200}}\;{\rm{kV}}\) DC power line suspects that its magnetic field may equal that of the Earth and affect compass readings. (a) Calculate the current in the wire needed to create a \({\rm{5}}{\rm{.00 \times 1}}{{\rm{0}}^{{\rm{ - 5}}}}{\rm{ T}}\) field at this distance. (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?

A cosmic ray electron moves at \({\rm{7}}{\rm{.50 \times 1}}{{\rm{0}}^{\rm{6}}}{\rm{ m/s}}\) perpendicular to the Earth’s magnetic field at an altitude where field strength is\({\rm{1}}{\rm{.00 \times 1}}{{\rm{0}}^{{\rm{ - 5}}}}{\rm{ T}}\). What is the radius of the circular path the electron follows?

Measurements affect the system being measured, such as the current loop in Figure 22.56

(a) Estimate the field the loop creates by calculating the field at the center of a circular loop 20.0 cm in diameter carrying 5.00A

(b) What is the smallest field strength this loop can be used to measure if its field must alter the measured field by less than 0.0100% ?
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