Asolenoidal coil with 25 turns of wire is wound tightly aroundanother coil with 300 turns. the inner solenoid is 25.0 cm long andhas a diameter of 2.00 cm. at a certain time, the current in theinner solenoid is 0.120 a and is increasing at a rate of1.75x103a/s. for this time, calculate; a) the average magnetic flux through each turn of the innersolenoid; b) the mutual inductance of the two solenoids; c) the emf induced in the outer solenoid by the changing current inthe inner solenoid

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

Iknow the first part it is the average star i am not 100% sure