Protons and electrons are ejected from the sun in large quantities. These charge particles, that travel to the earth from the sun along with electromagnetic radiation, are called the solar wind. The solar wind penetrates the atmosphere of the earth much more at the geopmagnetic north and south poles than anywhere else on the earth. Why? a. The magnetic field due to the earth is weakest near the poles. b. Sunlight is reflected most efficiently near the poles where the surface of the earth is mostly white. c. Light from the sun is refracted the most near the poles. d. The magnetic field due to the earth fluctuates the slowest near the poles e. Being near either pole places the observer far from city lights.

Protons and electrons are ejected from the sun in large quantities. These charge particles, that travel to the earth from the sun along with electromagnetic radiation, are called the solar wind. The solar wind penetrates the atmosphere of the earth much more at the geopmagnetic north and south poles than anywhere else on the earth. Why? a. The magnetic field due to the earth is weakest near the poles. b. Sunlight is reflected most efficiently near the poles where the surface of the earth is mostly white. c. Light from the sun is refracted the most near the poles. d. The magnetic field due to the earth fluctuates the slowest near the poles e. Being near either pole places the observer far from city lights.

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2. A power line is suspended 10.0m above the ground and carries a current of 200 A. a. What is the strength of the associated magnetic field at ground level? b. How does this compare to the average ground level strength of Earth's magnetic field Bearth ≈ 3x10-5T? 3. Two power lines are separated by a distance of 3.00m. Each power line carries a current of 500A. The currents point in the same direction. What is the magnetic force between 10.0m segments of the two wires?
For any vector quantity, be sure to always include the magnitude and direction ty
1. .A straight wire with length L carries a current I which is directed to the right and is perpendicular to an unknown uniform magnetic field B. A magnetic force F acts on a conductor which is directed downwards. A. Determine the magnitude and the direction of the magnetic field in the region through which the current passes. B. If the angle between the current and the magnetic field is e this time, what would be the new value of the magnitude of the new magnetic force? Pointing System for No. 1: • What are the given in the problem? • What are the unknown variables? • What are the equations that you are going to use? • Solution and answer for Part A. Solution and answer for Part B. L (cm) = 2306 | (A) = 13 F (pN) = 24 O = 61
1. A circular loop with a diameter of 15.0 cm lies on a horizontal plane as viewed from above. Through it is a 3.8 A of current moving clockwise. What is the magnitude and direction of the magnetic field at the center of the loop?
The time-averaged intensity of sunlight that is incident at the upper atmosphere of the earth is 1,380 watts/m2. What is the maximum value of the electric field at this location? a. 660 N/C b. 1,950 watts/m2 c. 1,200 N/C d. 840 N/C e. 1,020 N/C
Describe how the magnetic domains in an unmagnetized iron rod will respond to the presence of a strong external magnetic field. a. The domains will split into monopoles. b. The domains will tend to align with the external field. c. The domains will tend to orient themselves perpendicular to the external field. d. The domains will tend to align so as to cancel out the external field.
2. An electron has a speed of 1.4 x 106 m/s. It travels through a 3.8 T magnetic field that is perpendicular to its velocity. An electric field is perpendicular to the B field and the velocity of the electron. The electron's velocity is constant. Find the magnitude of the electric field.
Pr2. A very long, straight current-carrying wire is bent at the middle two different ways, so that it takes the shapes depicted in figures a) and b). Find the direction and magnitude of the magnetic field in both cases at the center C of the semicircle (of radius R = 10 cm), if the current flowing in the wire is I = 2 A. a) b) С.
The NOAA Space Weather Scales describe three types of space weather storms: Geomagnetic storms, Solar Radiation storms, and Radio Blackouts. A single large solar event can result in all three types of storms being observed at Earth. Assuming a single solar event causes all three to occur, in what order would we expect to observe the three storms? Choose the correct order from the options below. The storms are listed by arrival time, from first to last. A. First Geomagnetic, then Solar Radiation, then Radio Blackout. B. First Solar Radiation, then Radio Blackout, then Geomagnetic. C. First Radio Blackout, then Geomagnetic, then Solar Radiation. D. First Geomagnetic, then Radio Blackout, then Solar Radiation. E. First Radio Blackout, then Solar Radiation, then Geomagnetic. F. First Solar Radiation, then Geomagnetic, then Radio Blackout.
1. You've recently read about a chemical laser that generates a 20-cm-diameter, 25 MW laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this laser beam to launch small payloads into orbit. To see if this might be feasible, you do a quick calculation of the acceleration of a 20-cm-diameter, 100 kg, perfectly absorbing block. What speed would such a block have if pushed horizontally 100 m along a frictionless track by such a laser?
Force on a Wire: The magnetic force on a current-carrying wire in a magnetic field is the strongest when Group of answer choices A. the current is at a 180° angle with respect to the magnetic field lines. B. the current is perpendicular to the magnetic field lines. C. the current is in the direction opposite to the magnetic field lines. D. the current is at a 0° angle with respect to the magnetic field lines. E. the current is in the direction of the magnetic field lines.
A hydroxide ion (OH−) in a glass of water has an average speed of about 600 m/s. A. Determine the magnitude of the electrical force between the hydroxide ion (charge -e) and a positive ion (charge +e) that is 1.0×10−8 m away (about the separation of 30 atoms). B. Determine the magnitude of the maximum magnetic force that Earth's 3.0×10−5 T magnetic field can exert on the ion.

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	a.	The magnetic field due to the earth is weakest near the poles.
	b.	Sunlight is reflected most efficiently near the poles where the surface of the earth is mostly white.
	c.	Light from the sun is refracted the most near the poles.
	d.	The magnetic field due to the earth fluctuates the slowest near the poles
	e.	Being near either pole places the observer far from city lights.