Physics Answers

A taho vendor carries a 1.5 m long light plank over his shoulder. At the ends of the plank are two buckets weighing 40 N and 60 N respectively. (a) Find the value of force F exerted by his shoulder. Neglect the weight of the plank. ( b) Where should he support the plank for it to be balanced horizontally ( refer to FIG 1) 

A flat circular coil with 40 loop of wire has a diameter of 32cm what current most flow in it's wire to produce a field in air of 3.0x10^-4 w/m2 or centre

Activity 2: Identifying Conductors and Insulators. Identify which of the following are conductors and insulators by using a table. Procedure Activity 2: Identifying Conductors and Insulators. Identify which of the following are conductors and insulators by using a table. Procedure 1. The following materials must be prepared: an electroscope, materials such as fur, glass, wood, silk, coins, steel, washers, rubber, paper, and a charged plastic sheet.

Activity 2: Identifying Conductors and Insulators. Identify which of the following are conductors and insulators by using a table. Procedure 1. The following materials must be prepared: an electroscope, materials such as fur, glass, wood, silk, coins, steel, washers, rubber, paper, and a charged plastic sheet.

14. How many electrons have been removed from a positively charged particle if it has a net charge of 5 x 10-9 C? A. 5 x 10-9 electrons C. 1 x 10-8 electrons B. 2.5 x 10-9 electrons D. incomplete information D A C B η 16 _____15.A sphere of radius 0.05 m has a charge of 2.0 nC. The charge is said to be located at the center of the sphere. The magnitude of electric field inside the surface is A. zero C. half the original value B. twice the original value D. thrice the original value

11. A test charge produced an electric field, E, at point 3 m away from the charge. The point where the field is half its original values is located at A. 1.5 m from the charge C. 4.5 m from the charge B. 6 m from the charge D. at the point of charge 12. The electric field of a body is directly related to its ________. A. momentum B. kinetic energy C. potential energy D. charge it carries 13. Charge q1 (26.0 µC) and q2 (-47.0 µC) experienced an electrostatic force of 5.70 N between them at a distance of ____ A.1.39 m B.1.93 m C.2.14 x 10-19 D.1.464 x 10-8

10. The electric flux through the surface at the right is ____ A. zero B. positive C. negative D. unknown

For Nos. 7 to 9, refer to the diagram below: 7. A positively charged rod was brought near to a metallic plate; what is the type of charge induced along the side facing the rod? A. positive B. negative C. neutral D. depends on number of charges 8. If the positively charged rod was touched on the neutral metallic plate, what is the charge of the plate? A. same B. negative C. positive D. depends on number of charges 9. After the positively charged rod is placed near the plate, a grounded wire was attached. What is the charge of the plate after the wire is removed? A. .negative B. neutral C. positive D. depends on number of charges 

5. Three spheres were brought together. When Spheres A and B are brought together, they attract. When spheres B and C are brought together, they also repel. Which of the following is true? A. Spheres A & C have same signs C. Spheres A & B have similar signs B. Spheres B & C have same signs D. Spheres A & C have opposite signs 6. The first object has a charge of +3nC, and the second object has a charge of 6 n C. Which is true about the electric forces between these objects? A. F1on2= 2F2on1 B. 3F1on2= 6F2on1 C. -6F1on2=2F2on1 D. F1on2=F2on1

. The diagram below shows the behavior of the electroscope before and after a positively charged rod is placed near the electroscope knob. This tells us that the movement of electrons is from ____. A. Rod to leaves C. Knob to leaves, then back to knob B. Leaves to knob D. Leaves to knob, then back to leaves 2. A glass rod was positively charged when rubbed with a silk cloth. The net positive charge is accumulated because the glass rod __________. A. loses protons B. loses electrons C. gains electrons D. loses electrons 3. Gravitational forces and electric forces are both ________________. A. forces with attractive and repulsive behaviors B. indirectly proportional to the square root of separation between bodies C. directly proportional to the product of the masses and charges D. decreasing when the distance between two bodies is decreasing