Which of the following statements is true about a current-carrying wire in a magnetic field?
a. reversing the current direction will cause the force deflecting the wire to be parallel to the magnetic field.
b. reversing the current direction will cause the force deflecting the wire to be perpendicular to the magnetic field but in the opposite direction.
c. reversing the current direction will not affect the force deflecting the wire.

Act has a 1200: 5 or 240: 1 turns ratio. it is short circuited. what is the maximum current at 1200a primary if we put a 100ohm resistor across the secondary end of the ct. use it as current source circuit.

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.