Which source, A or B, should be switched on so that the magnetic field will de upward, helping balance the conductor's weight? Explain. (ans: Source B-

An airplane is flying due north at 720 km/h. The Earth’s magnetic field has a northward component of 0.020 mT and a downward component of 0.050 mT (Southern Indiana).  (a) If the wingspan (distance between wingtips) is 35 m, what is the motional emf between the wingtips? (b) Which wingtip has the higher electric potential?

A loop of highly conducting wire is placed in a magnetic field that is increasing out of the page (through the loop) at a rate of 1.80 T/s. If the loop has an area of 0.400m^2, calculate the current flowing in Amps through the 5.00 ohm resistor.

How much current must pass through a horizontal power transmission cable in order for the magnetic field at a location 21 m directly below it to be equal to the Earth's magnetic field, which is approximately 8.0 x 10-5 T? Express your answer to two significant figures and include appropriate units. Value Units ?

Question 1: When an external magnetic flux through a conducting loop decreases in magnitude, a current is induced in the loop that creates its own magnetic flux through the loop. How does that induced magnetic flux affect the total magnetic flux through the loop? O It does not affect the total magnetic flux. O It decreases and then increases the total magnetic flux. OIt increases the total magnetic flux. OIt increases and then decreases the total magnetic flux. O It decreases the total magnetic flux. Part (a) Some additional information, which is not included in the video, is that the SI unit of magnetic flux is the weber, denoted Wb. Using that information and the contents of the video, solve this numerical problem: A conducting loop, with a resistance of 2.0 Q2, encloses magnetic flux that is increasing at the rate of 2.0 Wb/s. The magnitude of the current induced in the loop is... (select the best choice) Part (b) 02A 04A 01/2A O1A 01/4 A Imagine a circular conducting loop glued…

Motional EMF Below is a rectangle that is being pulled into a magnetic field as shown. The rectangle has a height of h = 0.400 m and is being pulled to the right with a velocity of v = 188.0 m/s. This magnetic field starts where shown, so the left most side of the rectangle has no magnetic field. There is 1 loop with a total resistance of R = 15.40 Ohms. The magnetic field has a magnitude of B = 34.0 mT. That means as the loop moves to the right, the magnetic flux inside the loop is increasing. Magnetic Field (out of the page) Direction of velocity What is the induced current within the wire in this system? (Use a negative sign for clockwise current) Make sure to give your answer with appropriate significant figures and remember that you are looking for a magnitude. Your Answer: Answer units Height

The figure shows four currents. The value of the line integral of the magnetic ficld B over the closed loop B.dl is 1°ri 8