A long, vertical, straight wire carries a current I. The wire is perpendicular to the plane of a circular metal loop and passes through the center of the loop (see the drawing). The loop is allowed to fall and maintains its orientation with respect to the straight wire while doing so. In what direction does the current induced in the loop flow

There will be no induced current

Explanation:

This question requires us to tell the direction which the current induced in the loop flows.

As current changes in a conductor, so also would the magnetic field that is produced by this conductor. The magnetic field lines are parallel to rings plane.

So no current is induced I the ring. Since the wire has zero current, the magnetic field would stay the same The flux which is associated with this ring is going to remain as zero and there would be no induced current.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.