Acircular loop of flexible iron wire has an initial circumference of 167 cm, but its circumference is decreasing at a constant rate of 15.0 cm/s due to a tangential pull on the wire. the loop is in a constant uniform magnetic field of magnitude 0.500 t, which is oriented perpendicular to the plane of the loop. assume that you are facing the loop and that the magnetic field points into the loop. a) find the magnitude of the emf e induced in the loop after exactly 8.00 s has passed since the circumference of the loop started to decrease. b) find the direction of the induced current in the loop as viewed looking along the direction of the magnetic field. (clockwise or counterclockwise? )

Part a)

Part b)

Since the radius is decreasing so induced current will increase the flux through the coil

So it would be clockwise in direction

Explanation:

As we know that magnetic flux linked with the coil is given as

now the rate of change in flux is given as

now we know that circumference is decreasing at rate of 15 cm/s

so here we know the length of circumference as

So rate of change in circumference is

final length of circumference at t = 8 s

Part a)

Now the induced EMF is given as

Part b)

Since the radius is decreasing so induced current will increase the flux through the coil

So it would be clockwise in direction

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d