Which of the following has no effect in external magnetic field? with reason pl
a)charge moving in the direction perpendicular to field
b)chaning flux
c)charge at rest
d)current carrying conductor
e)current carrying coil

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

Idon’t quite understand this problem

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.