Exercises PDF Physics Past Paper

Exercises Question I: choose the correct answer 1) Two charged objects are separated by a distance (d). The first charge is larger in magnitude than the second charge, so: a) The first charge exerts a larger force on the second. b) The second charge exerts a larger force on the f...

Exercises Question I: choose the correct answer 1) Two charged objects are separated by a distance (d). The first charge is larger in magnitude than the second charge, so: a) The first charge exerts a larger force on the second. b) The second charge exerts a larger force on the first. c) The charges exert forces on each other equal in magnitude and opposite in direction or pointing in the same direction. d) Both a and b. 2) Two-point charges, initially 4.0 cm apart, experience a mutual force of magnitude 1.0 N. If they are moved to a new separation of 1.0 cm. What is the magnitude of the new electric force between them? a) 4.0 N b) 1/4 N c) 16 N d)1/16 N 3) The electric field intensity under a power line, which carries 660 KV and the line is at 30 meters above ground equal…………………………… a) 19.8 KV/m b) 22 KV/ m c) 45 KV/m d) 90 KV/m 4) A +3.0 C charge is at the origin and a +9.0 C charge is at x = 4.0 m. Where on the x-axis can a third charge be placed so the net force on it is zero? a) x = 2.4 m b) x = 1.5 m c) x = 0.6 m d) x = 0.5 m 5) Two-point charges each have a value of +3 C and are separated by a distance of 4.0 m. What is the magnitude of the electric field at a point midway between the two charges? a) Zero b) 09 ×107 N/C c) 18 ×107 N/C d) 4.5 ×107 N/C 6) Three-point charges are located at the following positions: q1 = 2.0 C at x = 1.0 m; q2 = 3.0 C at x = 0; q3 = -5.0 C at x = -1.0 m. What is the magnitude of the force on q2? a) 5.4 ×10-2 N b) 0.135 N c) 0.189 N d) 9.0 ×10-2 N 7) From the charges distribution as shown ( ), ( ) ( ) The electrostatic force is equal to ………. Newton a) b) c) d) Page -1- 8) Electric flux is defined as the number of field lines that pass through a given surface and it can measured by …………….. a) b) c) d) 9) The net electric flux through any real or imaginary closed surface is equal to ….. a) b) c) d) 10) According to coulomb's law, the electric force is proportional …… to r2 and ……… to the interaction charges. a) Directly-Inversely b) Inversely-Directly c) Directly- Directly d) no relation 11) Coulomb's law is only valid in the case of ……………………………… charge. a) movable b) accelerated c) Static d) All of the above 12) When the number of electric field lines increase, the flux will be ………………………….. a) Increase b) Decrease c) Constant d) None of the above 13) Is the space around the charge when the charge's effect appears a) Electrical force b) Electrical potential c) Electrical field intensity d) Electrical field 14) A 10 mC particle is moved from infinity to a point where the electric potential energy is 5 J. What is the electric potential at the particle's destination? a) 500 V b) 50 V c) 5 V d) 0.5 V 15) The unit of potential (V) =…… a) N/C b) F.m/C c) J/C d) Both b & c Page -2-