If the flow of charged particles in some region of space includes electrons moving to the right and positive ions moving to the left, which direction is the current?

a. to the right
b. to the left only if the positive ions are doubly ionized or more
c. the current is zero
d. to the left cannot be determined without more information

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

Which transition by an electron will release the greatest amount of energy? oa ob oc od

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.