Awainaideannagi
2022-07-23
Answered

A bar magnet falls under the influence of gravity along the axis of a long copper tube. If air resistance is negligible, will there be a force to oppose the descent of the magnet? If so, will the magnet reach a terminal velocity?

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Clarissa Adkins

Answered 2022-07-24
Author has **16** answers

The magnetic field of the magnet induces a current in the copper tube. This current moves in the opposite direction of the magnetic field of the magnet. So, the answer is yes there will be a force to oppose the descent of the magnet.

Also, the answer is yes, the magnet reaches a terminal velocity where the induced current induces a magnetic field in the opposite direction which decreases the speed of the magnet.

Result:

Yes

Also, the answer is yes, the magnet reaches a terminal velocity where the induced current induces a magnetic field in the opposite direction which decreases the speed of the magnet.

Result:

Yes

asked 2022-05-17

Gauss's Law for magnetism is

$\mathrm{\nabla}\cdot B=0$

This allows us to write the magentic field B as the curl of another field the magnetic vector potential, A.

$B=\mathrm{\nabla}\times A$

This adhers to $\mathrm{\nabla}\cdot (\mathrm{\nabla}\times A)=0$

However, if a monopole does exist then we have

$\mathrm{\nabla}\cdot B={\rho}_{m}$

Where ${\rho}_{m}$ is some magnetic charge density however with a magentic vector potential this violates the equation, $\mathrm{\nabla}\cdot (\mathrm{\nabla}\times A)\ne 0$

Does that mean if magnetic monopoles does exist, that the magnetic field can no longer be defined by a magnetic vector potential? In which case how was dirac able to still define the magnetic field by a magnetic vector potentials?

$\mathrm{\nabla}\cdot B=0$

This allows us to write the magentic field B as the curl of another field the magnetic vector potential, A.

$B=\mathrm{\nabla}\times A$

This adhers to $\mathrm{\nabla}\cdot (\mathrm{\nabla}\times A)=0$

However, if a monopole does exist then we have

$\mathrm{\nabla}\cdot B={\rho}_{m}$

Where ${\rho}_{m}$ is some magnetic charge density however with a magentic vector potential this violates the equation, $\mathrm{\nabla}\cdot (\mathrm{\nabla}\times A)\ne 0$

Does that mean if magnetic monopoles does exist, that the magnetic field can no longer be defined by a magnetic vector potential? In which case how was dirac able to still define the magnetic field by a magnetic vector potentials?

asked 2022-05-15

The area of a rectangular loop is $200\text{}c{m}^{2}$, and the plane of the loop makes an angle of ${41}^{\circ}$ with a 0.28-T magnetic field. What is the magnetic flux penetrating the loop?

asked 2022-07-22

Two charged bodies create a superposition of electrostatic fields at a point and there is no evidence of fields interference. Now, if we put two current circuits around the charged bodies then we create also magnetic fields and as a consequence two electromagnetic fields. If the electrostatic field and the magnetic field from the two positions don't interfere as waves when independently acting will their combination in the form of electromagnetic field show interference properties when combined?

asked 2021-11-16

Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 20.0 kg and box B has mass 5.0 kg. A horizontal force of 250 N is exerted on box A. What is the magnitude of the force that box A exerts on box B?

asked 2021-01-28

Coaxial cylinders:

A long metal cylinder with a radius a is supported on an insulating stand on the axis of a long, hollow, metal tube with radius b. The positive charge per unit length on the inner cylinder is ? , and there is an equal negative charge per unit length on the outer cylinder. (a) calculate the potential V(r) for:

i) $r<a$

ii) $a<r<b$

iii) $r>b$

Take $V=0\text{}at\text{}r=b$

asked 2021-02-03

An airplane pilot sets a compass course due west and maintainsan airspeed of 220 km/h. After flying for 0.500 h, she find sherself over a town 120 km west and 20 km south of her starting point. a) Find the wind velocity (magnitude and direction). b) If the wind velocity of 40 km/h due south, in what direction should the pilot set her course to travel due west? Use the same airspeed of 220 km/h.

The answers are:

a) 44.7 km/h, 26.6 deg. west of south

b) 10.5 deg. north of west

asked 2022-05-10

Magnetic force and work

If the magnetic force does no work on a particle with electric charge, then: How can you influence the motion of the particle? Is there perhaps another example of the work force but do not have a significant effect on the motion of the particle?

If the magnetic force does no work on a particle with electric charge, then: How can you influence the motion of the particle? Is there perhaps another example of the work force but do not have a significant effect on the motion of the particle?