Field Theory Answers

What potential difference is required to accelerate a proton from rest to a speed of 5.72E7 m/s?

 An electron enters a parallel plate apparatus as seen in Figure 7 with an initial velocity of 2.05E6 m/s. The magnitude of the electric field strength across the plates is 237.7 N/C and the length of the plates is 7.08 cm. Determine the exit velocity of the electron.

The parallel plate apparatus in Figure 6 accelerates electrons across a potential difference of 2963.6 V. Determine the speed with which the electron reaches the positively charged plate.  (b) How could this apparatus be modified to accelerate protons?  (c) If a proton was accelerated instead of an electron, with what speed would it reach the negative plate?

Figure 4 is a typical Van de Graff generator with an aluminum sphere of radius 9.9 cm, producing an electric potential of 93.5 kV near its surface. The sphere is uniformly charged so we can assume that all the charge is concentrated at the centre. (a) Determine the charge on the sphere. (b) Calculate the magnitude of the electric field near the surface of the sphere.

Two equally charged objects of mass 1.68 kg are located 0.08 m apart.  Determine the possible charges on the objects if the net force on each of them is zero.

An electric charge of 8.85 x 10-13 C is placed at the centre of a 

sphere of radius 1m. What is the total electric flux linked with the 

sphere? How will the electric flux change if another equal and 

dissimilar charge is introduced at a distance of (i) 0.5m from the 

centre, (ii) 1.5m from the centre?

The gravitational field strength experienced by a 5 kg puppy on planet Fizzics is 50 N/kg. What would the gravitational field strength of the owner of the puppy standing next to him be if the owner has a mass of 10 times larger than the puppy?

A billiard ball moving at 5.0m/s strikes a stationary ball of the same mass.  After the collision, the ball moves at 4.33m/s at an angle of 30.0° with respect to the original line of motion.  Assuming an elastic collision, find the magnitude and direction of the struck ball’s velocity.

A ladder is placed against a building so that the ladder makes an 81° angle with the ground.  If the ladder is 5.0m long with a mass of 7.5kg and an 82kg painter stands at the 4.0m point of the ladder, determine the minimum coefficient of static friction required to prevent the ladder from sliding; assume there is no friction between the ladder and the wall.

g=9.8

G=6.67×10^-11

R=8.40×20⁷

M=?