Please answer the following question clearly Exercise 29.36 K) 7 of 14 ) Constan
ID: 2036109 • Letter: P
Question
Please answer the following question clearly
Exercise 29.36 K) 7 of 14 ) Constants Part A Ur A metal ring 4.30 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. These magnets produce an initial uniform field of 1.12 T between them but are gradually pulled apart, causing this field to remain uniform but What is the magnitude of the electric field induced in the ring? :decrease steadily at 0.300 T/s V/m Submit Request Answer Part B In which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet? O Clockwise O Counterclockwise Submilt Next> of Provide FeedbackExplanation / Answer
(A)
dB/dt = -0.3 T/s
Induced emf is:
e = -d(phi)/dt = -d(BA)/dt , since phi = BA
=> e = -A* dB/dt
= - (pi*d2/4) *dB/dt
= - (pi*0.0432/4) * (-0.3)
= 4.357 x 10-4 V
Thus the electric field is:
E = e/L = e/2pi*r
= (4.357 x 10-4)/(2pi*0.0215)
= 3.225 x 10-3 V/m
(B)
Clockwise
The induced magnetic field will be in the direction to oppose the change. Since the magnetic flux from the magnets is decreasing, the induced magnetic field will be in the same direction as the magnet's field.