Do you mind if I use this example for my assignment?
1 answer:
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1. False
Explanation: it's exactly the opposite. In fact, Lenz's law states that the induced current and the induced emf in a conductor are generated in such a direction that opposes to the change in magnetic flux through the coil. This is summarized by the negative sign in the Faraday's Newmann Lenz law:
where is the emf induced and
is the rate of change of magnetic flux through the coil.
Lenz's law is a consequence of the law of conservation of energy. In fact, we have:
- If the magnetic flux through a coil is increasing, then the induced current has a direction such that the magnetic field generated by the coil is opposite to the direction of the external magnetic field, in order to decrease the total flux
- If the magnetic flux through a coil is decreasing, then the induced current has a direction such that the magnetic field generated by the coil is in the same direction as the external field, in order to increase the total flux
2. False
Explanation: the magnetic flux through a surface is given by
where
B is the magnitude of the magnetic field
A is the surface area
is the angle between the direction of B and the normal vector to the surface
As we see, the magnetic flux depends not only on B and A, but also on the orientation of the coil with respect to the magnetic field.
3. False
Explanation:
- Sound waves are mechanical waves: mechanical waves are waves consisting of oscillations of the particles in a medium. Due to their nature, therefore, mechanical waves can propagate only in the presence of a medium
- Electromagnetic waves are NOT mechanical waves: they consist of oscillations of electric and magnetic fields, in a direction perpendicular to the direction of propagation of the wave. Since em waves are not mechanical waves, they do NOT need a medium to propagate, since they can also travel through a vacuum; therefore the original statement is false.
Answer:
Part a)
Part b)
Direction is 45 degree North of West
Part c)
Part d)
direction of velocity will be 45 Degree North of West
Part e)
Part f)
North of East
Explanation:
Initial position of the cyclist is given as
due East
final position of the cyclist after t = 21.0 s
due North
Part a)
for displacement we can find the change in the position of the cyclist
so we have
so magnitude of the displacement is given as
Part b)
direction of the displacement is given as
so it is 45 degree North of West
Part c)
For average velocity we know that it is defined as the ratio of displacement and time
so here the magnitude of average velocity is defined as
Part d)
As we know that average velocity direction is always same as that of average displacement direction
so here direction of displacement will be 45 Degree North of West
Part e)
Here we also know that initial velocity of the cyclist is 13 m/s due South while after t = 21 s its velocity is 13 m/s due East
So we have
change in velocity of the cyclist is given as
now average acceleration is given as
so the magnitude of acceleration is given as
Part f)
direction of acceleration is given as
North of East