Question 6 (5 marks) A DC motor of square coil ABCD with sides 10.0 ch consists of 100 turns. It is rotated in the field of a
uniform permanent magnet of field strength 20 mT, as shown in Figure 5. The current in the square coil
is 500 mA.
Figure 5
In the position shown, what is the magnitude of the net force on the arms AB?
2 marks

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)

The path of a satellite orbiting the earth causes it to pass directly over two tracking stations a and b, which are 51 miles apart. when the satellite is on one side of the two stations, the angles of elevation at a and b are measured to be 87 degrees and 84 degrees, respectively. (a) how far is the satellite from station a? (b) how high is the satellite above the ground?

What is the specific heat of wood ?