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Chapter 23: Q23.1-2PE (page 860)

What is the value of the magnetic flux through the coil in figure b due to the wire?

Short Answer

Expert verified

The value of the magnetic flux coil is zero.

Step by step solution

01

Definition of Magnetic flux

The entire magnetic field that travels across a particular area is measured by magnetic flux. It's a helpful tool for describing the effects of the magnetic force on things in a specific location.

02

Calculate the value of flux

The flux created by a contour with an area\(A\)in a constant magnetic field\(B\)that makes an angle\(\phi \)with the plane of the contour can be expressed as,

\({\rm{\Phi = BAcos(}}\phi {\rm{)}}\)鈥︹�︹�︹�︹�︹�︹�︹��(1)

The angle in the given situation is the right angle, hence the flux will be zero from equation (1) because the cosine of a right angle \({\rm{90}}^\circ \)is zero.

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Most popular questions from this chapter

Explain what causes physical vibrations in transformers at twice the frequency of the AC power involved.

When a magnet is thrust into a coil as in Figure 23.4(a), what is the direction of the force exerted by the coil on the magnet? Draw a diagram showing the direction of the current induced in the coil and the magnetic field it produces, to justify your response. How does the magnitude of the force depend on the resistance of the galvanometer?

How do the multiple-loop coils and iron ring in the version of Faraday鈥檚 apparatus shown in Figure 23.3 enhance the observation of induced emf?

A short circuit to the grounded metal case of an appliance occurs as shown in Figure \({\rm{23}}{\rm{.60}}\). The person touching the case is wet and only has a \({\rm{3}}{\rm{.00 k\Omega }}\) resistance to earth/ground.

(a) What is the voltage on the case if \({\rm{5}}{\rm{.00 mA}}\) flows through the person?

(b) What is the current in the short circuit if the resistance of the earth/ground wire is \({\rm{0}}{\rm{.200 \Omega }}\)?

(c) Will this trigger the \({\rm{20}}{\rm{.0 A}}\) circuit breaker supplying the appliance?

A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 335 kV. The secondary of this transformer is being replaced so that its output can be 750 kV for more efficient cross-country transmission on upgraded transmission lines.

(a) What is the ratio of turns in the new secondary compared with the old secondary?

(b) What is the ratio of new current output to old output (at 335 kV) for the same power? (c) If the upgraded transmission lines have the same resistance, what is the ratio of new line power loss to old?
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