Fields and their patterns Question 9 Multiple Choice Questions Like charges will always repel each other. Question 1 B (ANS) The force between two isolated positive Question 10 point charges will always be repulsive. The force is due to the second charge being in The gravitational field at P will not be zero, the electric field of the first charge. as the field drops off inversely with d2, so D (ANS) the field associated with the mass (2m) will be smaller than the field associated with the Question 2 mass (m). The two positive charges will always have a The two isolated point charges will both force of repulsion between them. produce a field in the opposite direction and The best answer is of the identical magnitude at the point P. C (ANS) B (ANS) Question 3 The field associated with C will be from the We draw the field around an imaginary right to the left at the point P. magnetic monopole so that it looks like the The field associated with D will be from the field around an isolated point charge, in that right to the left at the point P. it can have two directions. C is the best answer, even though the Extended Questions (gravitational) field around a point mass is Question 11 (2017 Question 1, 63%) always attractive. C (ANS) The resultant field will be the vector addition of the fields associated with the Question 4 three charges. The electric field is the direction of the force on a unit positive We are yet to find a magnetic monopole. charge. C (ANS) The field from the left hand -Q, will be to Question 5 the left. The field from the right hand -Q, will be to All fields are vectors. the right, but smaller. D (ANS) The field from the left hand +Q, will be to the left. Question 6 net force to the left. We model the electric field between two large charged plates as uniform. A (ANS) Question 12a Question 7 D (ANS) Exactly in the middle of the two masses, the Question 8 force of attraction will be equal and opposite The direction and magnitude of the fields from the two masses. for A, B and C will change in time. D (ANS)
Fields and their patterns Multiple Choice Questions Question 1 The force between two isolated positive point charges will always be repulsive. The force is due to the second charge being in the electric field of the first charge. D (ANS) Question 2 The two positive charges will always have a force of repulsion between them. The best answer is C (ANS) Question 3 We draw the field around an imaginary magnetic monopole so that it looks like the field around an isolated point charge, in that it can have two directions. C is the best answer, even though the (gravitational) field around a point mass is always attractive. C (ANS) Question 4 We are yet to find a magnetic monopole. C (ANS) Question 5 All fields are vectors. D (ANS) Question 6 We model the electric field between two large charged plates as uniform. A (ANS) Question 7 D (ANS) Question 8 The direction and magnitude of the fields for A, B and C will change in time. D (ANS) Question 9 Like charges will always repel each other. B (ANS) Question 10 The gravitational field at P will not be zero, as the field drops off inversely with d2, so the field associated with the mass (2m) will be smaller than the field associated with the mass (m). The two isolated point charges will both produce a field in the opposite direction and of the identical magnitude at the point P. B (ANS) The field associated with C will be from the right to the left at the point P. The field associated with D will be from the right to the left at the point P. Extended Questions Question 11 (2017 Question 1, 63%) The resultant field will be the vector addition of the fields associated with the three charges. The electric field is the direction of the force on a unit positive charge. The field from the left hand -Q, will be to the left. The field from the right hand -Q, will be to the right, but smaller. The field from the left hand +Q, will be to the left. net force to the left. Question 12a Exactly in the middle of the two masses, the force of attraction will be equal and opposite from the two masses.
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