The number of lines of force or magnetic flux normally passing through an area of 60 dm² is 4Wb. How much magnetic force will it exert on a conductor if the electrical resistance of the conductor is 1.1Ω and the electrical voltage on it is 1.1 V. The length of the conductor part contained in homogeneous magnetic field is 1dm.

Which statement is true? a) the work done to lift an object 6 meters is greater than the gravitational potential energy it gains. b) the work required to push an object is less than the work required to pull an object the same distance. c) the work required to raise an object to a height is equal to the gravitational potential energy the object gains. d) the work done against gravity to lift an object straight up is greater than the work required to roll it up a ramp.