A square wire with 2 m sides is perpendicular to a uniform magnetic field, with half the area of the loop in the field as shown in the figure. The loop contains a 20 V battery with negligible resistance. If the magnitude of the field varies with time according to B = 1.1410 - 0.8500 t with B in teslas and t in seconds, what is the total emf in the circuit?

The loop in the figure is being pushed into the 0.20 TT magnetic field at 50 m/sm/s. The resistance of the loop is 0.30 ΩΩ .(Figure 1)   What is the magnitude of the current in the loop? Express your answer in amperes.

A coil with 31.2 turns of wire is wrapped on a frame with a square cross section 1.68 cm on a side. Each turn has the same area, equal to that of the frame, and the total resistance of the coil is 0.412 Ω.  An applied uniform magnetic field is perpendicular to the plane of the coil, as in the figure below. If the field changes uniformly from 0.000 T to 0.554T in 0.703 s, find the magnitude of the induced current in the coil while the field is changing.

A car generator turns at 400 rpm when the engine is idling. Its 300 turn, 5.1 cm by 8.15 cm rectangular coil rotates in an adjustable magnetic field so that it can produce sufficient voltage even at low rpms. What is the field strength (in T) needed to produce a 27 V peak emf?

The figure below shows a piece of insulated wire formed into the shape of a figure eight. You may consider the two loops of the figure eight to be circles, where the upper loop's radius is 3.00 cm and the lower loop's radius is 8.00 cm. The wire has a uniform resistance per unit length of 9.00 Ω/m. The wire lies in a plane that is perpendicular to a uniform magnetic field directed into the page, the magnitude of which is increasing at a constant rate of 1.70 T/s. What is the magnitude of the induced current in the wire (in A)?

A circuit is set up as the figure below. . (a) Find current I₁ and I2. (b) If the 3 resistor is a heater and is heating a cup of 30 g of water and 10 g of ice that is originally at 0°C. What would be the final temperature of the water after 30 minutes? (c) Draw two arrows at location P to show the direction of magnetic field due to Wirel and Wire2, respectively. 18 V L 4Ω M 202 12 02 P 1₁ AAA 1Ω Wire1 Wire2 3Ω

A conducting wire shaped in a “U shape” is connected to a  5 ohm light bulb.The 0.8 T external magnetic field is directed into the page as shown.  A conducting bar of length 1.2 m is sliding on the conducting  wire at 2 m/s to the right. What is the induced emf? Hint:  the induced emf is the negative of the change in magnetic flux. The magnetic flux changes because the area of the U shaped wire placed in the magnetic field changes when the conducting wire slides to the right.  Induced emf <=>   emf = -N ∆Φ/∆t∆Φ =∆(BA)= B ∆A =B  ( Af-Ai) Group of answer choices A) 1.92 V B) 0.8 V C) 2.4 V D) 6.8 V   Please show how you solved the question and provide explanations. I am struggling in this section of physics, so I greatly appreciate your guidance.

A square loop of conductive wire Is laid flat against this computer screen. Each side of the square is 3.0m long. A 5.0T magnetic field passes through the loop, oriented so that it points directly out of your screen. If the magnetic field drops to only 2.0T over the course of 1.5 seconds, what emf will be produced in the square loop?

Suppose you wish to measure the current in a wire. You have a device that can measure the strength of the magnetic field produced by the wire, but the device does not directly measure the current. If the device is place 1.32m away from the wire, and the magnetic field strength is 0.93μT, what is the current running through the wire in Amps? Note: It is understood that the unit of your answer is in A, however do not explicitly include units in your answer. Enter only a number. If you do enter a unit, your answer will be counted wrong.

A 100-turn square wire coil of area 0.040 m2 rotates about a vertical axis at 1,450 rev/min, as indicated in the figure below. The horizontal component of Earth's magnetic field at the location of the loop is 2.0 ✕ 10−5 T. Calculate the maximum emf (in V) induced in the coil by Earth's field.