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QUESTION 2 (6 marks) A physicist measured the electric field strength at different distances away from a point charge. The data is plotted in the graph. Electric field strength (N ch a) b) 0 0.005 0.01 0.015 0.02 0.025 0.03 . er2 3 (m) : : : : 1 Identify the mathematical relationship between £ and [3 marks] r Use the mathematical relationship identified in 2a) to deduce the magnitude of the charge creating the electric field. [3 marks] C (to 1 decimal place)
QUESTION 5 (4 marks) An electron is situated halfway between two nuclei that are separated from each other by a distance of 4.5 x 107 m. The first nucleus contains two protons. The second nucleus contains three protons. Calculate the magnitude of the overall electromagnetic force experienced by the electron. N (to 1 decimal place)
QUESTION 4 The diagram shows two charges (¢ and g ) separated by a distance (d). d g@t> 0 There is a force F acting between the two charges. Calculate the magnitude of the force acting between the two charges if d is halved and the charge of ¢ is doubled. (A) 1IF (B) 2F (C) 4F (D) 8F
QUESTION 17 Electrical potential energy is the (A) 1ntensity of an electric field at a particular location. (B) difference in potential that tends to give rise to an electric current. (C) capacity of electric charge carriers to do work due to their position in an electric circuit. (D) work done on an electron in accelerating it through an electrical potential difference of one volt.
QUESTION 1 (3 marks) A charge of 2.8 x 1077 C experiences an electrostatic force of 5.2 X 10~ N when placed near a charge of 32%x 1077 C. Calculate the distance between the two charges. Distance = m (to 2 significant figures)
QUESTION 10 Electric field strength refers to the (A) 1ntensity of an electric field at a particular location. (B) change in electrical potential energy between two defined points. (C) sum of electrically charged particles passing a point in a given time. (D) physical property of an object experiencing a force in an electromagnetic field.
QUESTION 4 The correct definition of Coulombs law is (A) (B) ©) (D) the total electric charge of an isolated system remains constant regardless of changes within the system. the direction of an induced electric current always opposes the change in the circuit or the magnetic field that produces it. when the magnetic flux linking a circuit changes an electromotive force (EMF) is induced in the circuit proportional to the rate of change of the flux linkage. like electric charges repel and opposite electric charges attract with a force proportional to the product of the electric charges and inversely proportional to the square of the distance between them.
QUESTION 7 Calculate the electric field strength (E) at 2 cm from a charge of 2.5 C. (A) 5.6x10°NC' (B) 23 x10°NC (C) 11x102NC! (D) 5.6 x10°NC
QUESTION 11 Coulomb’s law describes the observation that (A) an electromotive force in a circuit may be induced through changes in the magnetic flux. (B) charged particles moving across magnetic field lines experience a force. (C) achange in the electromotive force is opposed. (D) like electric charges repel one another.
QUESTION 19 Calculate the electric field strength experienced at a distance of 2.8 x107!! m from the centre of a helium nucleus. (A) 1.0x10°NC! (B) 2.0x10°NC! (C) 3.7x10?NC! (D) 7.3xl0*NC!
QUESTION 3 (8 marks) Three charges are in a straight line as shown. +5.0 wC +5.0 uC +40 uC S T U e~«~_ re 2r e Net force on T= +2.8 N a) Calculate the electric field strength at 7. Show your working. [2 marks] Electric field strength = NC! (to two significant figures) b) Determine the value of r. Show your working. [6 marks] r= m (to two significant figures)
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