The earth's magnetic field, like any magnetic field, stores energy. the maximum strength of the earth's field is about 7.0 x 10-5 t. find the maximum magnetic energy stored in the space above a city if the space occupies an area of 4.8 x 108 m2 and has a height of 1500 m.

1.4 x 10^9 J

Explanation:

magnetic field, B = 7 x 10^-5 T

Area, A = 4.8 x 10^8 m^2

height, H = 1500 m

the formula for the energy density is given by

Total energy = Energy density x Volume

U = 1.4 x 10^9 J

Thus, the maximum magnetic energy stored is 1.4 x 10^9 J

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

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.