A closely wound rectangular coil of 80 turns has dimensions of 25.0 cm by 40.0 cm The plane of the coil is rotated from a position where it makes an angle of 37.0 ° with a magnetic field of 1.60 Tto a position perpendicular to the field. The rotation takes 0.0700 s. What is the average emf induced in the coil? Express your answer with the appropriate units. HA 59 V
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- 003 A circular coil of wire 7.8 cm in diameter has a resistance of 1.61 2. It is located in a magnetic field of 0.304 T directed at right angles to the plane of the coil. The coil is removed from the field in 0.169 s. What is the induced emf in the coil? As- sume the magnetic flux is reduced linearly. Answer in units of V. How much electric energy is lost in the process? Answer in units of J.A circular loop with a radius of 2.5 m rests horizontally inside a uniform magnetic field of 0.9 T in a down direction. What is the induced emf when the magnetic field drops to zero in 0.75 s? O a. 9.40 V O b. 23.6 V O c. 34.2 V O d. 17.5 VA straight wire carries a steady current / in a downward direction. A conducting bar touching two parallel conducting rails moves upward with velocity v. What is the polarity of the induced emf in terminals X and Y? X Y O X and Y are at the same potential. O X is positive and Y is negative. O Yis positive and X is negative.
- A 10-turn generator coil with area 0.150 m2 rotates in a 1.25-T magnetic field. At what frequency should the coil rotate to produce a peak emf of 150 V?A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 315 kV. The secondary coil of this transformer is being replaced so that its output can be 725 kV for more efficient cross-country transmission on upgraded transmission lines. V1 = 315 kVV2 = 725 kV What is the ratio of turns in the new secondary to the number of turns in the old secondary? What is the ratio of new current output to the old current output for the same power input to the transformer? If the upgraded transmission lines have the same resistance as the original ones, what is the ratio of new line power loss to the old?A planar coil of wire has a single turn. The normal to this coil is parallel to a uniform and constant (in time) magnetic field of 1.80 T. An emf that has a magnitude of 2.40 V is induced in this coil because the coil's area A is shrinking. What is the magnitude of AA/At, which is the rate (in m²/s) at which the area changes? Number i Units
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