Electricity and Magnetism Answers

512 g of an unknown metal at a temperature of 15^oC is dropped into a 100 g aluminum container holding 325 g of water at 98^oC. A short time later, the container of water and metal stabilizes at a new temperature of 78^oC. Identify the metal.  

1.what is the relationship between number of windings in the solenoid and the deflection of the galvanometer needle?

A long, straight, current-carrying wire runs from north to south.

a. A compass needle placed above the wire points with its north pole toward the east. In

what direction is the current flowing?

b. If a compass is put underneath the wire, in which direction will the needle point?

Consider three point charges at the corners of a triangle, as shown in the figure, where q1 = 8.00 x10^-9C, q2 = −4.00 × 10^−9 C, and q3 = 6.00 × 10^−9 C. Find the magnitude and direction of the resultant force on q3

 commuter airplane takes the route shown in Figure 3.20. First, it flies from the origin of the coordinate system shown to city A, located 175 km in a direction 30.0° north of east. Next, it flies 153 km 20.0° west of north to city B. Finally, it flies 195 km due west to city C. Find the location of city C relative to the origin. after landing in city C, the pilot wishes to return to the origin

along a single straight line. What are the components of the vector representing this displacement?

What should the heading of the plane be?

A commuter airplane takes the route shown in Figure 3.20. First, it flies from the origin of the coordinate system shown to city A, located 175 km in a direction 30.0° north of east. Next, it flies 153 km 20.0° west of north to city B. Finally, it flies 195 km due west to city C. After landing in city C, the pilot wishes to return to the origin along a straight line. What are the components of the vector representing this displacement? What should the heading of the plane be?

Problem 2.12 Use Gauss's law find the electric field inside a uniformly charged sphere (charge density p). Compare your answer to Prob. 2.8.

A person who works with large magnets sometimes places her head inside a strong

field. She reports feeling dizzy as she quickly turns her head. How might this be

associated with induction?

A ray of purple light hits the surface of a metal which has energy
threshold (2/3) times the energy quanta of violet light. If the frequency of the    purple light is 10^16 Hz and Plank's constant = 6.626.10^−34 , determine the kinetic energy of electrons escaping from the metal surface.