The average intensity of sunlight reaching Earth is about 1360 W/m2. What is the rms magnetic field of a TEM wave with this intensity? The Earth’s magnetic field has a magnitude of 5 × 10-5 T. How does your answer from part (a) compare? Why don’t we feel this magnetic field?

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?

QB2d. Calculate the EMF induced in the railway carriage wheel of radius R=840 mm by the magnetic field of the Earth. Consider that the magnetic field of the Earth makes an angle of 71.5 deg with the horizontal surface of the railway track. Take the speed of the carriage to be v = = 158 km h¹ and the value of the magnetic field of the Earth B = 10-5 T. Provide your answer in microvolts (10-6 V=1 μV): for example, if you calculated the value to be 0.000075 V, then enter 75 as your answer. Enter your answer in the box below.

Hence show that the wave equation for the magnetic field is V²H+k²H=0 where k = ₁√√μ₁&

||| INT A 20-cm-long, zero-resistance wire is pulled outward, on zero-resistance rails, at a steady speed of 10 m/s in a 0.10 T magnetic field. (See Figure P25.630.) On the opposite side, a 1.0 carbon resistor completes the circuit by connecting the two rails. The mass of the resistor is 50 mg. a. What is the induced current in the circuit? b. How much force is needed to pull the wire at this speed? c- Calculate the power dissipation in the resistor. 1.0 Ω X X X X X X X X X X X X X X X 0 XX X 0 Ω Χ 1 = 20 cm X X X 0.1 T X X X X X X Χ 0Ω Χ X X X X X X X v = 10 m/s

Suppose you have an electric field as a result of superposition of two waves given by Ē(z, t) = Eo cos(kz - wt) + Eo cos(kz + wt)â. a. Simplify Ē(z, t) as one term and find its associated magnetic field b. Find the instantaneous and time-averaged energy density.

The maximum value of the electric field in a light wave is 800 N/C. Calculate the rms value of the magnetic field in this wave in Tesla.

The electric field of an electromagnetic wave in a vacuum is Ey =( 23.0 V/m)cos((V/m)cos(( 9.78 ×108)x−ωt), where x is in mm and t is in s. What s the wave's wavelength? Express your answer with the appropriate units.   What is the wave's frequency? Express your answer with the appropriate units.   What is the wave's magnetic field amplitude? Express your answer with the appropriate units.

Mehul

A plane electromagnetic wave is traveling in a vacuum. The magnetic field is directed along the z-axis and given by: B, = 3.0µT sin ((1.0 × 107 )x - (3.0 × 1015 )t ) a) Determine the wavelength , of the wave. b) What is the frequency, f, of the wave in Hertz? c) Determine the maximum strength of the B-field. d) Determine the maximum strength of the E-field and it direction. e) Can you find a time and place when the B-field is zero? f) What is the strength of the E-field when the B-filed is zero?