- In the figure below a very small circular metal ring of radius r = 0.5 cm and resistance R = 50 is at the center of a larger solenoid of radius ri = 50 cm with 1000 windings over a length of 10cm. Att = 0 sec, the solenoid carries a clockwise current of 3 A; at t = 0.05 sec, it carries a counterclockwise current of 5 A. %3D %3D %3D (a) What is the magnitude of the emf induced in the small ring during this time? (b) What is the magnitude of the current in the small ring during this time? m (c) What is the direction of the current?

8. A long solenoid of radius a with n turns per unit length is carrying a time-dependent current I(t) = I, sin(ot), where I, and o are constants. The solenoid is surrounded by a wire of resistance R that has two circular loops of radius b with b>a (see the figure). Find the magnitude of current induced in the outer loops at time t= 0. a b

A metal ring is oriented with the plane of its area perpendicular to a spatially uniform magnetic field that increases at a steady rate. After the radius of the ring is doubled, while the rate of increase of the field is cut in half, the emf induced in the ring remains the same. increases by a factor of 2. increases by a factor of 4. decreases by a factor of 2.

Long solenoid has 211 turns/cm and carries a current i=1.5A; its radius is 1.8 cm. A coil of 101 turns and diameter 6.6 cm is placed outside the solenoid as shown in the figure. If the current in the solenoid is decreased to zero during 25 ms, what is the magnitude of the emf induced in the coil during this time interval? Coil Solenoid Select one: a. 1.62 mV b. 550.02 mv C. 163.64 mV d. 5.45 mV

The flexible loop in the figure below has a radius of 13 cm and is in a magnetic field of strength 0.12 T. The loop is grasped at points A and B and stretched until its area is nearly zero. If it takes 0.18 s to close the loop, what is the magnitude of the average induced emf (in mV) in it during this time? A В |E| = 3.54*10**-2 X mV

A solenoid of lenght 40 cm has 360 turns of radius 2.8 cm. A tightly wound coil with 8 turns of radius 6 cm is placed around the solenoid. The axes of the coil and solenoid coincide. Find the emf induced in the coil if the current in the solenoid varies according to I = 6sin(120Tt) A. -6.301 cos(120Tt) mV

A solenoid has a cross-sectional area of 4.9 x 10-4 m², consists of 490 turns per meter, and carries a current of 0.33 A. A 17-turn coil is wrapped tightly around the circumference of the solenoid. The ends of the coil are connected to a 1.5-o resistor. Suddenly, a switch is opened, and the current in the solenoid dies to zero in a time of 0.040 s. Find the average current induced in the coil. Number i Units

In the figure a 130-turn coil of radius 5.00 cm and resistance 5.00 Ω is placed around a smaller diameter solenoid (d = 3.20 cm). The long solenoid in the figure has 240 turns per centimeter and carries a current of 1.30 A. The current in the solenoid is reduced to zero and then increased to -1.30 A in a time of 4.00×10-2 s. What is the magnitude of the induced current in the outer coil while the solenoid current is being changed?

In the figure, a 110-turn coil of radius 3.2 cm and resistance 7.7 Q is coaxial with a solenoid of 260 turns/cm and diameter 4.6 cm. The solenoid current drops from 2.1 A to zero in time interval At = 32 ms. What current is induced in amperes in the coil during At? Coil Solenoid Number i Units >

In the figure a 120-turn coil of radius 5.00 cm and resistance 2.00 Ω is placed around a smaller diameter solenoid (d = 3.20 cm). The long solenoid in the figure has 210 turns per centimeter and carries a current of 1.50 A.The current in the solenoid is reduced to zero and then increased to -1.50 A in a time of 3.00×10-2 s. What is the magnitude of the induced current in the outer coil while the solenoid current is being changed?