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Solar Magnetic Energy. Magnetic fields within a sunspot can be as strong as 0.4 T. (By comparison, the earth’s magnetic field is about 1/10,000 as strong.) Sunspots can be as large as 25,000 km in radius. The material in a sunspot has a density of about 3 × 10−4 kg/m3. Assume μ for the sunspot material is μ0. If 100% of the magnetic-field energy stored in a sunspot could be used to eject the sunspot’s material away from the sun’s surface, at what speed would that material be ejected? Compare to the sun’s escape speed, which is about 6 × 105 m/s. (Hint: Calculate the kinetic energy the magnetic field could supply to 1 m3 of sunspot material.)
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Chapter 30 Solutions
University Physics with Modern Physics (14th Edition)
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Lecture- Tutorials for Introductory Astronomy
- (a) Calculate the power per square meter reaching Earth's upper atmosphere from the Sun. (Take the power output of the Sun to be 4.001026 W.) (b) Part of this is absorbed and reflected by the atmosphere, so that a maximum of 1.30 kW/m2 reaches Earth's surface. Calculate the area in km 2 of solar energy collectors needed to replace an electric power plant that generates 750 MW if the collectors convert an average of 2.00% of the maximum power into electricity. (This small conversion efficiency is due to the devices themselves, and the fact that the sun is directly overhead only briefly.) With the same assumptions, what area would be needed to meet the United States' energy needs (1.051020J) ? Australia's energy needs (5.41018J) ? China's energy needs (6.31019J) ? (These energy consumption values are from 2006.)arrow_forwardIf the temperature of the surface of the object is 568.1 °F , then calculate its value in K. O a. 606.39 O b. 499.18 O c. 570.83 O d. 24.83 A magnetic field of 7.1 T passes through a single loop square coil of side length 4.4 x 10-2 m which makes 46.8° angle with the area vector of the coil. Find the magnetic flux associated with the coil in Wb/m²? O a. 0.940951 O b. 0.013746 O c. 0.029546 O d. 0.009410arrow_forwardThe Russian physicist P. A. C˘ erenkov discovered that a charged particle traveling in a solid with a speed exceeding the speed of light in that material radiates electromagnetic radiation. (This is analogous to the sonic boom produced by an aircraft moving faster than the speed of sound in air; see Section 16.9. C˘ erenkov shared the 1958 Nobel Prize for this discovery.) What is the minimum kinetic energy (in electron volts) that an electron must have while traveling inside a slab of crown glass (n = 1.52) in order to create this C˘ erenkov radiation?arrow_forward
- Q1 Match the physical situation with the Maxwell's equation that would be useful in analyzing the situation: (a) Gauss's law 1. Find the magnetic field inside a current-carrying coaxial cable. (b) Gauss's law for 2. Predict what an AC voltmeter reads magnetism whose leads encircle a coil. (c) Faraday's law 3. Find the amount of charge inside a box. (d) law Ampere-Maxwell 4. Relate the magnetic flux on one face of a cube to the magnetic flux on the other faces.arrow_forwardreaches the ground with an intensity of about 1.0kW/m2 . A sunbather has a body surface area of 0.8 m2 facing the sun while reclining on a beach chair on a clear day. (a) how much energy from direct sunlight reaches the sunbather’s skin per second? (b) What pressure does the sunlight exert if it is absorbed?arrow_forwardAn electron travels with a speed of 7.0 x 106 m/s between the two parallel charged plates shown in the figure below. The plates are separated by 1.0 cm and charged by a 200 V battery. a. Determine the strength and direction of the electric field between the two plates. b. What is the direction and magnitude of the force on the electron due to this electric field? c. What magnetic field (strength and direction) will allow the electron to pass between the plates without being deflected? ++++ ++++ 1.0 cmarrow_forward
- Where did this come from? Explain pleasearrow_forwardA proton is fired with a speed of 1.1 ×106m/s through the parallel-plate capacitor shown in the figure(Figure 1). The capacitor's electric field is E⃗ =( 1.0 ×105V/m,down). a. What is the strength of the magnetic field B⃗ that must be applied to allow the proton to pass through the capacitor with no change in speed or direction? b. What is the magnetic field strength in the proton's reference frame? c. What is the electric field strength in the proton's reference frame?arrow_forwardPlease take your time and review the pictures because several of them are multi-part questions that required more than one picture. A cosmic ray proton moving toward the earth at 5.03 x 10^7 m/s experiences a magnetic force of 1.68 x 10^16 N. What is the strength of the magnetic field if there is a 42-degree angle between it and the protons velocity? A 2.8 C charge with a velocity v = 2i +0j + 3k m/s enters a region where there is a uniform magnetic field of B = 2i + 3j + 1k; compute the vector force on the charge. A DC power line for a light-rail system carries 900 A at an angle of 29.5 degrees to the earth's 4.96 x 10^5 T field. What is the force on a 100m section of this line? An electromagnet produces a magnetic field of magnitude 1.5 T throughout a cylindrical region of diameter 12 cm. A straight wire carrying a current of 25 A passes through the field, What is the magnetic force on the wire, magnitude, and direction? A proton moves at 7.51 x 10^7 m/s perpendicular to a magnetic…arrow_forward
- College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax CollegePhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
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