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Transcript

Electric Forces, Fields, and Voltage (1) Find the net force at B: (A) 2.00 μC 6.00 cm 70.0° 55.0° (B) 3.00μC 6.00 cm 55.0° 10.0 cm (C) -5.00 μC (2) Two point charges of 2.00 x 10-7 C and 8.50 x 10-8 C are 12.0 cm apart. (a) What electric field does each produce at the site of the other? (b) What force acts on each charge? (c) Where between them will the electric field be zero? (3) Two equally charged objects 3.20 mm apart are released from rest. The acceleration of the first particle is 7.00 ms-2 and the seconds is 9.00 ms-2. If the mass of the first particle is 6.30 x 10-7 kg, (a) what is the mass of the second particle? And (b) what is the common charge? (4) Consider a point charge of 1.50 x 10-8 C. (a) what is the radius of an equipotential surface having a potential of 30.0 V? (b) are equipotential surfaces evenly spaced in radius? (5) An electrostatic field of 1.00 x 10-5 NC-1 is pointing radially towards towards the surface of the earth. If we wish to make a 0.00100 N balloon remain stationary in the field, (a) what type of charges (protons or electrons) would have to be added to the balloon and why? And (b) how many protons or electrons would have to be added to the initially neutral balloon? (6) An electron is shot from the positive plate towards the negative plate in a parallel plate set-up with an initial speed of 1.00 x 106 cms-1. How large must the voltage be across the plates if the electron is to stop just before it reaches the negative plate? (7) A -100. μC charge and a 200. μC charge are 10.0 m apart. Find the net electric field intensity 6.00 m from the -100. μC charge on a line between the two charges. If a test charge is placed at this position mentioned above and experiences a force of 1.00 x 10-4 N, what is the size of the test charge? (8) Points A and B are 20.0 cm apart on a line. There is a point charge of 3.00 μC at A and -4.00 μC at B. (a) What is the voltage at point C which is 15.0 cm on the other side of B? (b) What is the electric field intensity at point C? (c) How much force would act on a 1.00 μC charge placed at point C? (c) How much work would have to be done to move the 1.00 μC charge from position C to position D which is 25.0 cm from B? A 20.0 cm B 15.0 cm C 10.0 cm D