can I get help on 1 2 4 5 7 12 13 15 16 17 18 20 21 and 23 pls. I will rate up

Question 1 Question 12 are not related to each other. part 1 of 1 10 points part 1 of1 10 points Question 15 A single circular loop of wire in the plane of In a model generator, a 470-turn rectangu part 1 of 1 10 points the page is perpendicular to a uniform mag- lar coil 0.074 m by 0.27 m rotates with an netic field B directed into the page, as shown. angular frequency of 12.7 rad/s in a uniform Can an efficient transformer step up en- 8 magnetic field of 0.66 T. ergy? What is the maximum emf induced in the 1. Theoretically yes, but it is hard to build coil? such transformers in practice. Answer in units of V. 2. No, there is no such thing as an "efficient Question 13 ransformer". part 1 of 1 10 points 8 8 3. No, energy is conserved and cannot be If the magnitude of the magnetic field is A ideal transformer shown in the figure stepped up. increasing, then the induced current in the below having a primary with 20 turns and wire loop is secondary with 12 turns. 4. It cannot be determined. The load resistor is 62 0. 5. Yes, provided that the transformer is 1. directed upward out of the paper. The source voltage is 85 Vrms. made of special material such as amino acid or other organic compounds. 2. counterclockwise around the loop. 6. Yes, stepping up voltage is the same as 080 3. zero. (No current is induced.) stepping up energy. 12 turns 20 turns 85 Vim 62 52 Question 16 4. directed downward into the paper. part 1 of 1 10 points 5. clockwise around the loop. What is the rms electric potential across Which of the folowing has the highest fre- the 62 0 load resistor? quency? Question 2 Answer in units of Vrms- part 1 of 1 10 points L. visible light A solenoid 4.97 cm in diameter and 16.4 cm 2. infrared light long has 168 turns and carries a current of 11.2 A. Question 17 3. radio wave Find the magnetic flux through the circular 4. X ray cross-sectional area of the solenoid. part 1 of 1 10 points Answer in units of T . m . 5. gamma ray The electric field in an electromagnetic of 6. ultraviolet light wave (in vacuum) is described by Question 4 E - Emax sin(kr - wt), part 1 of 1 10 points where Emar - 37 N/C and k 6.6 x 10' m A circular loop of wire with a radius The speed of light is 2.99792 x 10 m/s. 2.891 cm is placed in a magnetic field such Find the amplitude of the corresponding that it induces an EMF of 2.26 V in the cir- magnetic wave. cular wire loop. If the cross-sectional diame- Answer in units of T. ter of the wire is 0.722 mm, and the wire is made of a material which has a resistivity of Question 18 1.5 x 107 0m, how much power is dissipated part 1 of 1 10 points in the wire loop? What is the principal difference between a Answer in units of W. radio wave and visible light? Question 5 1. They travel at different speeds. part 1 of 1 10 points 2. Light is more powerful than radio waves. A strong electromagnet produces a uniform field of 2.37 T over a cross-sectional area of 3. Radio waves have lower frequencies than 0.31 m . A coil having 205 turns with a to- visible light waves. tal resistance of 24.4 $ is placed around the electromagnet, and the current in the electro- 4. Radio waves are not electromagnetic waves. magnet is turned off, reaching zero in 8.6 ms. What current is induced in the coil? 5. Radio waves are sound waves. Answer in units of A. Question 20 Question 7 part 1 of 1 10 points part 1 of 1 10 points A circular coil of wire rests on your desk. What is the frequency of highly energetic A magnetic field is directed at right angles to ultraviolet radiation that has a wavelength of the plane of your desk and passes through the 128 nm? coil. For a clockwise current (as you look down The speed of light is 3 x 108 m/s. on your desk) to be generated, the magnetic field must be directed Answer in units of Hz. 1. upward away from the desk and be in- creasing in time. Question 21 2. upward away from the desk and be con- part 1 of 1 10 points stant in time. 3. downward toward the desk and be con- A plane electromagnetic wave has an aver- stant in time. age power per unit area of 373 W/m . A flat, 4. downward toward the desk and be in- rectangular surface, 16.4 cm by 26.9 cm, is creasing in time. placed perpendicular to the direction of the plane wave. If the surface absorbs half the energy and reflects half, calculate the net energy absorbed in 0.751 min. Answer in units of J. Question 23 part 1 of 1 10 points A mirrored surface is illuminated by a 428 m W laser with a beam diameter of 0.5 um. The speed of light is 2.9979 x 10 m/s and the index of refraction is 1. What is the magnitude of the force on the mirrored surface? Answer in units of N