Which one of the statements are TRUE? * The magnetic field near a long, straight wire carrying a direct current does not have a circular shape dependent on current flow.
When a compass is placed near a copper wire, with current flowing in the wire, the compass will always point north.
Electricity and magnetism are related.
A current cannot produce a magnetic field.

the area between the graph and the t axis

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

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.