A 140-turn circular coil has diameter 4.5 cm. A magnetic field perpendicular to the coil is changing at 0.80 T/s.  What is the induced emf in the coil?  The symbology is what is killing me.  I don't understand the logic steps or where you have to substitute values to determiine the emf.

Which of the following statements are true? Choose all that apply. A changing magnetic field will always induce a voltage. As current through an inductor decreases, the inductance remains constant. For an LR circuit, as R increases, & decreases. Transformers can simultaneously decrease voltage & decrease current. Generators transform electrical energy (electricity) into kinetic energy. The mks units for inductance are Wb.

Q8.5 A circular plastic core is wrapped with a 22.0 m-long copper wire, with a diameter of 0.0200 mm and resistivity of 1.68×10-8 9-m, coiled 88 times, and its ends are linked to create a closed circuit. A magnetic field that increases at a constant rate of 12.0 mT/s, parallel to the coil's axis. Calculate the rate at which the wire produces thermal energy

6. The conducting rod shown in the accompanying figure moves along parallel metal rails that are 25-cm apart. The system is in a uniform magnetic field of strength 0.75 T, which is directed into the page. The resistances of the rod and the rails are negligible. a. What is the emf (including its sense) induced in the rod when it is moving to the right with a speed of 5.0 m/s? b. What force is required to keep the rod moving at this speed? c. What is the rate at which work is done by this force? d. What is the power dissipated in the resistor? B x M x x t x 25 cm 5.0 m/s 0.25 N * N

Words RE English (US) 4. A coil with 105 turns and an area of 1.45 m² is rotating in a magnetic field of 2.3 T. The coil is rotating at a rate of 25° per second. a. What is the induced emf in the ring? Choose the specific case of the coil moving from 0° to 25°. b. The ring has a resistance of 1.4 2. What is the current in the ring? C. What is the power dissipated in the ring? I

A flat circular coil with 100 turns has a radius of 0.04 m and a resistance of 0.5 ohms. It is exposed to a changing magnetic field that is perpendicular to the coil. The rate at which the magnetic field is changing is ∆B/∆t=0.782(T/s).   a. Find the emf (voltage) induced in the coil. b. What is the current in the coil? c. Sketch a picture of the scenario and, based on your drawing, show the direction of the induced current   PLEASE SHOW ALL WORK!! Thank you!!

A 95 turn, 10.0 cm diameter coil rotates at an angular velocity of 8.00 rad/s in a 1.30 T field, starting with the normal of the plane of the coil perpendicular to the field. Assume that the positive max emf is reached first. a) What (in V) is the peak emf? b) At what time (in s) is the peak emf first reached? c) At what time (in s) is the emf first at its most negative? d) What is the period (in s) of the AC voltage output?

A generator has a 460-turn coil that is 10 cm long and 12 cm wide. The coil rotates at 9.0 rotations per second in a 0.10-T magnitude B→ field. A)Determine the generator's peak voltage.

A powerful electromagnet has a field of 1.6T and a cross-sectional area of 0.20m2. if we place a coil having 200 turns and a total resistance of 20 around the electromagnet and turn off the power to the electromagnet in 20ms, what is the current induced in the coil?

In an AC generator, the magnetic field between the pole faces of the magnet is uniform and of strength 12 T, while the 400-cm2-area loop has 300 turns. What must be the frequency in Hz of the rotating loop so that the peak voltage from the generator is 100 kvolts?    a. 70 Hz   b. 90 Hz   c. 50 Hz   d. 110 Hz   e. 130 Hz