What are the negative & positive charged bodies on the basis of electrons?

Help with Science 30-1 please.?

• 1. During a lightning strike, 24 C of charge moved from the bottom of a cloud to the top of a water tower. The charge moved across an electric potential difference of 1.2 x 10^8 V. What amount of energy was released during the lightning strike? A. 2.88 x 10^9 J B. 2.00 x 10^-7 J C. 1.17 x 10^7 J D. 3.60 x 10^8 J 3. Which of the following can function as test bodies in a magnetic field? A. grass seeds B. compass needles C. tiny ebony particles D. negatively charged strips of paper 4. Which of the following is a source of a magnetic field? A. an ebonite rod B. an electrically charged cloud C. a current-carrying coil of wire D. a large iron sphere 5. Decide whether each statement is true (T) or false (F). Place your answer in the blank space given. a. The direction of the field lines of an electric field is either toward or away from the charged object. b. The direction of the field lines of a magnetic field is toward the field source. c. The direction of the field lines of a gravitational field is toward the field source. d. The density of the field lines indicates the field’s strength. 8. When drying a synthetic-fibre shirt in a clothes dryer along with other clothes, the shirt gained a surplus of 1.7 x 10^13 electrons. Determine the charge, expressed in coulombs, on the shirt. Include the sign of the charge. 10. Position B is twice as far from the centre of a planet than Position A. A rocket moves from Position A to Position B. How does the planet’s gravitational field strength change for the rocket? A. The gravitational field strength increases by a factor of 4. B. The gravitational field strength increases by a factor of 2. C. The gravitational field strength decreases by a factor of 1/2 D. The gravitational field strength decreases by a factor of 1/4 11. Suppose two identical balloons are each positively charged and positioned with their centres far enough apart so they are not close to touching each other. The balloons are then moved farther apart so that the distance between their centres doubles. What would be the expected change in the force of repulsion of one balloon on the other due to their increased separation? A. The magnitude of the force of repulsion increases by a factor of 4. B. The magnitude of the force of repulsion increases by a factor of 2. C. The magnitude of the force of repulsion decreases by a factor of 1/2 D. The magnitude of the force of repulsion decreases by a factor of 1/4 12. Assume that the force of the gravitational field strength on the surface of Mars is 3.70 N/kg. An astronaut is standing on the surface of Mars. In his spacesuit he has a mass of 215 kg. What would his weight be at that location? A. 854 N B. 796 N C. 116 N D. 58.1 N 13.Decide whether each statement is true (T) or false (F). Place your answer in the blank space given. a. The unit for mass is the newton. b. Electric field strength is equal to the magnitude of the electric force on a test body with a charge of 1 C. c. A magnetic field exerts a force on electrically charged objects that are motionless within the field. d. All moving electrical charges create a magnetic field. 14. Cosmic ray particles can do permanent damage to DNA, especially if both strands are damaged. Explain why damage to just one base on one strand of a DNA molecule may be repairable. 15. A student’s research indicates that Pluto’s radius is 1.172 x 10^6 m and its mass is 1.2 x 10^22 kg. a. Calculate the gravitational field strength at Pluto’s surface. Show your work. b. Calculate the force of gravity at Pluto’s surface on an object with a mass of 100 kg. 16. A balloon with a radius of 16 cm has an electric charge of 4.25x 10^–9 C. a. Determine the electric field strength at a distance of 40.0 cm from the balloon’s centre. b. A balloon with a radius of 14 cm and an electric charge of 3.75 x 10^–9 C is brought within the electric field of the larger balloon so their centres are 40.0 cm apart. Determine the magnitude of the electric force exerted by this electric field on the smaller balloon.

• Answer:

  U Yes