Question
please help
Equal currents of magnitude I travel into the page in wire M and out of the page in wire N. Eight directions are indicated by letters A through H. The direction of the magnetic field at point P is In the arrangement shown, a conducting bar of negligible resistance slides along horizontal, parallel, frictionless conducting rails connected as shown to a 2.0 ohm resistor. A uniform 1.5-T magnetic field is perpendicular to the plane of the paper. If L= 60 cm, at what rate is thermal energy being generated in the resistor at the instant the speed of the bar is equal to 4.2 m/s? In a region of space where the magnetic field of the earth has a magnitude of 80 mu T and is directed 30 degree below the horizantal, a 50-cm length of wire oriented horizontally along an east-west direction is moved horizontally to the south with a speed of 20 m/s. What is the magnitude of the induced potential difference between the ends of this wire? A ber (L = 80 cm) moves on two frictionaless rails, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m ohm, what is the magnetic force on the moving bar?
Explanation / Answer
The answer to #9 is G, due to the Right hand Rule, which states that a magnetic field is created in the direction your fingers curl if you have a current traveling in the direction of your thumb.
For #10 I am not sure how to find the current, however once you do, the formula for power is I^2/R.
I am unsure for the rest of them. There is some relation between magnetic field, length, velocity, and induced current.
