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BabaBlast [244]
4 years ago
7

The plane of a conducting loop is oriented parallel to the x-y plane. A magnetic field is directed in the -z direction.

Physics
1 answer:
jekas [21]4 years ago
5 0

Answer:

D) Rotate the loop about an axis that is directed in the z direction and that passes through the center of the loop

Explanation:

The magnetic flux is defined as the total magnetic field times the area normal to the magnetic field lines.

Mathematically:

\phi_B=\vec{B}.\vec{A}

where:

\vec{A}= area vector directed normal to the surface

\vec{B}= magnetic field vector

  • Now as the area of the loop changes there will be a change in magnetic flux.
  • Change in the magnetic field strength will also change the flux accordingly.
  • Since the loop lies in the x-y plane we will get a different area of normal projection on the plane whenever the inclination of the loop changes in xy-plane.
  • Since the area of the loop all remains in the magnetic field while it rotates about the z axis to its center hence this will not affect area subjected  to the magnetic field.
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Answer:

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Explanation:

See attached file

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4 years ago
A ball has a diameter of 3.77 cm and average density of 0.0839 g/cm3. What force is required to hold it completely submerged und
mestny [16]

Answer:

0.25 N

Explanation:

The density of the ball (\rho_b) = 0.0839 g/cm³ = 83.9 kg/m³

The density of water (\rho_w) = 1000 kg/m³

diameter = 3.77 cm = 0.0377 m

radius of ball = 0.0377/2 = 0.01885 m

The volume (V) = \frac{4}{3} \pi r^3=\frac{4}{3}*\pi*0.01885^3=2.8*10^{-5}\ m^3

Let us assume the acceleration due to gravity (g) = 9.8 m/s²

Hence:

The force is required to hold it completely submerged under water (F) is:

F=\rho_w Vg-\rho_b Vg=1000*(2.8*10^{-5})*9.81-83.9*(2.8*10^{-5})*9.81\\\\

F = 0.25 N

7 0
3 years ago
A projectile is shot horizontally at 23.4 m/s from the roof of a building 55.0 m tall. What is the time necessary for the projec
baherus [9]
The horizontal speed has no effect on the answer. 

It doesn't matter whether you flick a marble horizontally from the roof,
fire a high-power rifle horizontally from the roof, drive a school bus straight
off the roof, or drop a bowling ball from the roof with zero horizontal speed. 
Their vertical speed is completely determined by gravity, (and it happens to
be the same for all of them).

Handy dandy formula for the distance covered by anything that starts out
with zero speed and accelerates to the end:

            Distance = (1/2) (acceleration) x (time)²

If the beginning of the journey is on Earth, then the acceleration is
9.8 m/s² ... the acceleration of gravity on Earth.  We'll assume that
the 55-meter rooftop in the question is part of a building on Earth.

                       55 meters  =  (1/2) (9.8 m/s²) x (time)²           

Divide each side
by  4.9 m/s² :            55 m / 4.9 m/s²  =  (time)²

                                 (time)²  =  (55/4.9)  sec²

Square-root
each side:                time  =  √(55/4.9 sec²)

                                           =      3.35 sec  .
5 0
4 years ago
Which two statements are true of electromagnetic waves?
Usimov [2.4K]

Answer:

B and C

Explanation:

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