A low-frequency radio wave is oscillating at a rate of 60 MHz with a peak electric field of 120 N/C. Which of the following functions is the correct excpression for the magnetic field? а. 2л B (x,t) =40µTsin -(1.2x)(108)t b. 2л В (х,1) %3D0.40иTsin| 5 (1.2×)(10º)- 2л С. B (x,t) =4.0µTsin (1.2) ( O d. B (x,t) =0.40µTsin x- (1.0) (108): е. B (x,t) =0.40µTsin - (1.2) (10°),
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- If the electric field of an electromagnetic wave is oscillating along the z-axis and the magnetic field is oscillating along the x-axis, in what possible direction is the wave traveling?What is the average intensity of a 5.00-mm Electromagnetic wave that has a peak magnetic field of 19.0 nT?A dish antenna having a diameter of 14.0 m receives (at normal incidence) a radio signal from a distant source as shown in the figure below. The radio signal is a continuous sinusoidal wave with amplitude Emax = 0.400 µV/m. Assume the antenna absorbs all the radiation that falls on the dish. (a) What is the amplitude of the magnetic field in this wave? T (b) What is the intensity of the radiation received by this antenna? W/m² (c) What is the power received by the antenna? W (d) What force is exerted by the radio waves on the antenna? N
- Assume the helium-neon lasers commonly used in student physics laboratories have power outputs of 0.250 mW. (a) If such a laser beam is projected onto a circular spot 3.00 mm in diameter, what is its intensity (in watts per meter squared)? W/m2 (b) Find the peak magnetic field strength (in teslas). (c) Find the peak electric field strength (in volts per meter). V/mIn the figure an electric field is directed out of the page within a circular region of radius R = 3.50 cm. The magnitude of the electric field is given by E (0.800 V/m.s)(1 - r/R)t, where radial distance r≤R and t is in seconds. What is the magnitude of the magnetic field that is induced at radial distances (a)2.50 cm and (b)7.50 cm? R (a) Number i 3.2767933E-21 Units T (b) Number i 1.513724E-20 Units T > >Problem 5. As a parallel-plate capacitor with circular plates 20 cm in diameter is being charged, the displacement current density in the region between the plates is uniform and has a magnitude of 20 A/m². (µ₁ = 4×10−7 T·m/A, and &o = 8.85x10-¹2 C²/N·m²). (a) Calculate the magnitude B of the magnetic field at a distance r = 50 mm from the axis of symmetry of this region. (b) Calculate dE/dt in this region.
- The answers 0 and 7.0*10^-6 are incorrect; I have one more shot at this question. Please help.Problem 4. A magnetic field directed into the page changes with time according to B = 2.0t³ - 4.0ť² + 3.0, where B is in tesla and t is in seconds. The field has a circular cross section of radius R = 2.5 cm (see figure below). (a) When t= 1.00 s and r₁= 5.0 cm, what are the magnitude and the direction of the electric field at point P₁? (b)When t = 2.00 s and r2 = 2.0 cm, what are the magnitude and the direction of the electric field at point P₂? xxxxx xxxxx xxxx** ** xxx T97 xxx R x xxxxx ****** xxxxx Bin n P₁QB2d. 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.
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