Answer:
C. a closed loop of wire moving at constant velocity in a nonuniform static magnetic field.
Explanation:
As we know by Faraday's law that rate of change in magnetic flux will induce EMF
so mathematically we can say that
so we will have
so EMF will be induced if the flux linked with the closed loop will change with time.
So here correct answer will be
C. a closed loop of wire moving at constant velocity in a nonuniform static magnetic field.
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Explanation:
The Work done by any force is defined as the force applied times the displacement of point of application of force in the direction of force.
This is better represented as a scalar product of Force vector and displacement vector.
Here, the angle between force and displacement is 
.
∴ Magnitude of force = 
I believe it is called or referred to as the "Jet Stream". During World War II, allied pilots encountered high speed winds in the upper air. They named those winds after the fastest planes they came up against: fighters equipped with jet engines! Jet stream winds in winter time can reach up to 300 MPH as well!
As per the formula of time period of simple pendulum we can say
so from above formula we can see that time period of pendulum depends on the value of L
so here as we change the length of pendulum the time period will also change
so
Time Period = Dependent Variable
Length = Independent Variable
The correct answer is "All of the above".
In fact, electromagnetic induction occurs when there is a change of the magnetic flux through the area enclosed by a circuit (in this case, the area enclosed by the wire loop).
The magnetic flux
through a certain surface is given by
(1)
Where B is the intensity of the magnetic field, A is the area enclosed by the circuit and
is the angle between the direction of the field B and the perpendicular to the area.
In the first situation, the magnet is getting closer to the loop, so the magnetic flux through the area enclosed by the wire is increasing (because the intensity of the magnetic field B is increasing). Situation 2) is the opposite case: the wire loop is moving away from the magnet, so the intensity of the magnetic field B is decreasing, and therefore the magnetic flux is decreasing as well.
Finally, in the third situation the wire loop is rotating. Here the distance between the loop and the magnet is not changing, but remember that the magnetic flux depends also on the angle between the direction of the magnetic field and the perpendicular (formula 1), and so since the wire loop is rotating, than this angle is changing, therefore the magnetic flux is changing as well.
