Quiz 1 Physics 100B

Quiz 1] Physics 100B Name___________________________ 1) When the distance between the two charges is doubled, the force between them is A) doubled. B) quadrupled. C) reduced by a factor of 3. D) reduced by a factor of 4. Answer: D 2) Two charges, Q1 and Q 2, are separated by a certain distance R. If the magnitudes of the charges are doubled and their separation is also doubled, then what happens to the electrical force between these two charges? A) It is doubled. B) It changes by a factor of 3. C) It is quadrupled. D) It remains the same. Answer: D 3) Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in Figure 1. Which of the arrows shown represents the net force acting on the p oint charge with a charge +Q? A) A B) B C) C D) D Answer: A 56) Three equal point charges of varying signs are placed on the corners of a square of side d as shown in Figure 2. Which of the arrows shown represents the direction of the net electric field at the center of the square? A) A B) B C) C D) D Answer: A 5) Two point charges of +30.0 µC and -9.00 µC are separated by a distance of 20.0 cm. What is the intensity of electric field E midway between these two charges? A) 35.1 × 106 N/C directed towards the negative charge B) 35.1 × 106 N/C directed towards the positive charge C) 35.1 × 105 N/C directed towards the negative charge D) 35.1 × 105 N/C directed towards the positive charge Answer: A 6) A charged rod carrying a negative charge is brought near two spheres that are in contact with each other but insulated from the ground. If the two spheres are then separated, what kind of charge will be on the spheres? A) The sphere near the charged rod becomes positive and the other becom es negative. B) The sphere near the charged rod becomes negative and the other becomes positive. C) The spheres do not get any charge. D) None of the other choices is correct. Answer: A 7) Two charges, Q1 and Q 2, are separated by a certain distance R. If the magnitudes of their charges are doubled and their separation is halved, then what happens to the electrical force between these charges? A) It increases by a factor of 16. B) It stays the same. C) It is doubled. D) It is quadrupled. Answer: A