Log in
Physics
1
answer
0
watching
36
views
27 Nov 2019

<p>A long straight wire lying along the x-axis carries a constant 5 A current along the positive x direction. A small 5mm diameter loop lies in the x-y plane centered at y = 2m. If the loop is suddenly stretched so that its area shrinks to zero in 0.2s, find the average induced emf in the coil assuming the B field is constant over its area. Draw a sketch showing the direction of the induced current.</p>

Watch
1
answer
0
watching
36
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Nelly Stracke
Nelly StrackeLv2
15 May 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A 4mm diameter circular coil of 25 turns and total resistance0.001Ω lies in the x-y plane at a distance of 3m from a longstraight current-carrying wire along the x-axis. If the current inthe wire is increasing at a rate of 0.2 A/s, find the inducedcurrent in the coil and give its direction in a sketch. (Assumingthe magnetic flux is uniform over the area of the coil).

A lightning bold strikes the ground 200m away from a 100 turncoil. Suppose that the radius of the coil is .8 m and that thecurrent carried by the lightning bolt is 6.0 MA and falls to zeroin .0105s. What is the induced emf in the coil if it is orientedwith its normal along the magnetic field direction? If the wire hasa cross sectional area of 7 x 10-7 m2(diameter of wire is .001m) and it is made out ofcopper ( ρ=1.7 X 10-8 Ωm), what is the magnitude and directionof the induced current in the wire?

A coil of wire is connected to a power supply, and a currentruns in the coil. A single loop of wire is located near the coil,with its axis on the same line as the axis of the coil. The radiusof the loop is 2 cm.




At time t1 the magnetic field at the center of the loop, due to thecoil, is 0.4 T, in the direction shown in the diagram; the currentin the coil is constant.

(a) What is the absolute value of the magnetic flux through theloop at time t1?
Φ mag = T m2
(b) What approximations or assumptions did you make in calculatingyour answer to part (a)?

Check all that apply.

1.The magnitude of the magnetic field due to the coil is uniformover the area of the loop.
2.The magnetic field outside the loop is zero.
3. The magnetic field due to the coil is uniform in direction overthe area of the loop.


(c) What is the direction of the "curly" electric field inside thewire of the loop at time t1? (Remember that at this time thecurrent in the coil is constant.)
E = 0

At a later time t2, the current in the coil begins todecrease.

(d) Now what is the direction of the "curly" electric field in theloop?
counter-clockwise
At time t2 the rate of change of the magnetic field at the centerof the loop, due to the coil, is -0.36 T/s.
(e) At this time, what is the absolute value of the rate of changeof the magnetic flux through the loop?
|dΦmag/dt| = T m2/s
(f) At this time, what is the absolute value of the emf in theloop?
|emf| = V
(g) What is the magnitude of the electric field at location P,which is inside the wire?
|E| = V/m
(h) Now the wire loop is removed. Everything else remains as it wasat time t2; the magnetic field is still changing at the same rate.What is the magnitude of the electric field at location P?
|E| = V/m

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in