I forgot to add this part.
assume this wire has a resistance R which is a constant as the hoop is shrunk.
(a) What will be the current I which is
induced and show the direction of this current in your figure.
(b) What is the magnitude of the
induced B-field at the center of the hoop as a function of the radius R of the hoop? Show the
direction of the induced B-field.
A circular conducting hoop of wire has a constant
magnetic field |~B | = 1.7 Tesla passing through it so that the field direction is perpendicular to
the plane of the hoop. There is an EMF induced in the hoop with magnitude 2.6 Volts because
the hoops area A is shrinking (or equivalently the radius of the hoop is shrinking). What is the
magnitude of �A/�t which is the rate (in m2/s) at which the area is changing?
1 answer