Auniform electric field with a magnitude of 125 000 n/c passes through a rectangle with sides of 2.50 m and 5.00 m. the angle between the electric field vector and the vector normal to the rectangular plane is 65.0°. what is the electric flux through the rectangle? a) 1.56 × 106 n⋅m2/c b) 6.60 × 105 n⋅m2/c c) 1.42 × 105 n⋅m2/c d) 5.49 × 104 n⋅m2/c e) 4.23 × 104 n⋅m2/c

Explanation:

The electric flux through the rectangle is given by

where

E is the electric field strength

A is the area of the rectange

is the angle between the direction of the electric field and of the vector normal to the plane of the rectangle

In this problem we have

E = 125 000 N/C

The area of the rectangle is

and the angle is

so, the electric flux is

c) up is the direction the magnetic force is acting on the 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.