The electric potential along the x-axis is V = 100e-2x V, where x is in meters. a) What is the Ex at x = 1.0 m? b) What is the Ex at x = 2.4 m?

The magnetic field in the figure is decreasing at the rate 0.25 T/s.  (e = 1.60 x10-19 C, mproton = 1.67×10-27 kg) a) What is the magnitude of the acceleration of a proton at rest at point a? What is the direction of acceleration of point a? b) What is the magnitude of the acceleration of a proton at rest at point d? What is the direction of acceleration of point d?

a) What is the magnetic field amplitude of an electromagnetic wave whose electric field amplitude is 90 V/m? (2 points) b) What is the intensity of the wave? (3 points)  

The electric potential along the x-axis is V = 100e-2x V, where x is in meters. a) What is the Ex at x = 1.0 m? b) What is the Ex at x = 2.2 m?

The magnetic field in the figure is decreasing at the rate 0.80 T/s.  (e = 1.60 x10-19 C, mproton = 1.67×10-27 kg) a) What is the magnitude of the acceleration of a proton at rest at point a? What is the direction of acceleration of point a? b) What is the magnitude of the acceleration of a proton at rest at point d? What is the direction of acceleration of point d?

For a science project, you would like to horizontally suspend an 8.5 by 11 inch sheet of black paper in a vertical beam of light whose dimensions exactly match the paper. If the mass of the sheet is 1.1 g, what light intensity will you need? (1 in = 2.54 cm)

For a science project, you would like to horizontally suspend an 8.5 by 11 inch sheet of black paper in a vertical beam of light whose dimensions exactly match the paper. If the mass of the sheet is 1.2 g, what light intensity will you need? (1 in = 2.54 cm)

The current in a 100 watt lightbulb is 0.80 A. The filament inside the bulb is 0.30 mm in diameter. a) What is the current density of the filament? b) What is the electron current in the filament, in electrons per second?

A microwave beam with a wavelength of 1.5 cm has an intensity of 13 W/m2. What is the magnetic field amplitude? (

Field of a circular loop: Two coaxial circular coils of radius R = 15 cm, each carrying 4.0 A in the same direction, are positioned a distance d = 20 cm apart, as shown in the figure. Calculate the magnitude of the magnetic field halfway between the coils along the line connecting their centers. (μ0 = 4π × 10-7 T ∙ m/A)