A coil with a wire that is wrapped 40 turns around a 0.5 m2 hollow tube.  A uniform magnetic field is applied perpendicular to the plane of the coil.  The field changes uniformly from 0.00 T to 0.95 T in 2.0 s.  If the resistance in the coil is 3.0 Ω, what is the induced emf in the coil? Group of answer choices -3 V 0 V -1 V -10 V -9.5 V

The primary coil of a transformer has 329 turns; the secondary coil has 1000 turns. An alternating current is sent through the primary coil. The emf in the primary is of amplitude 10.2 V. What is the emf amplitude in the secondary?

A 50 cm long metal rod moves along the two rails in a plane of the circuit shown and is placed perpendicular to the magnetic field ( indicated by x) B = 0.15 T. If R = 3.0 ohm and the uniform speed v = 2.0 m/s, what rate is the energy dissipated in the resistor? Group of answer choices 1.25 W 7.5 mW 2.26 mW 4.9 mW

A square loop made of a metal wire is placed on the page. The length of both sides of the square decreases uniformly from 4.0 cm to 3.0 cm in 25 seconds. The loop is in a constant, uniform magnetic field directed out of the page and with a magnitude of 6.0 T. 1 cm = 0.01 m. 1. What is the average magnitude of the induced EMF produced in the loop during that time? 2. What is the direction of the induced electric current in the loop (explain in terms of B lines)?

A coil with loops of area 0.0120 m^2 rotates at 60.0 Hz through a B field of 0.125 T. How many loops must the coil have to produce a maximum EMF of 120 V? (Hint: The angular frequency is NOT 60.0 Hz.) (No unit) tional Academy of Science. All Rights Reserved. Q Search Ox F4 F5 F6 Loops F7 8 F8 H F9 Enter hulu prt sc F10 home F

The figure below displays a circular loop of aluminum wire in a uniform magnetic field pointing into the page. The radius of the loop is 11.0 cm and the magnitude of the field is 0.120 T. You grab points A and B and pull them in opposite directions, stretching the loop until its area is nearly zero, taking a time of 0.210 s to do so. What is the magnitude of the average induced emf in the loop (in mV) during this time? X * * * X * * mV X x XÓT X A X *3** B X X x x X x X X x

The flexible loop in the figure below has a radius of 11.0 cm and is in a magnetic field of magnitude 0.170 T. The loop is grasped at points A and B and stretched until its area is nearly zero. If it takes 0.190 s to close the loop, what is the magnitude of the average induced emf in it during this time interval? mV X x X X X x X x X x X A X X X B x Xx X X x X x X x X X

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A coil of 50 loops is pulled in 0.02 s from between the poles of a magnet, where its area intercepts a flux of 3.1 x 10-4 Wb, to a place where the intercepted flux is 0.1 x 10-4 Wb. Determine the induced emf.  Group of answer choices 7.5 mV 7.5 V 75 mV 0.75 V

品 日 : 00 OD 應用程式 說明: X X X X 28°C ●O X TALK New TOEICO Q 搜尋 江 ex0526a.png 活動 COCO 聊天 28. The accompanying figure shows a single-turn rectangular coil that has a resistance of 2.0 2. The @ magnetic field at all points inside the coil varies according to B = = where Bo = 0.25 T and a = 200 Hz. What is the current induced in the coil at (a) t = 0.001 s, (b) 0.002 s, (c) 2.0 s? Boe-at 9 作業 行事曆 B A X X 檔案 X X 5.0 cm X F 03:00 2022/5/26 X X er's Manual C er's Manual er's Manual er's Manual er's Manual X 15 14 13 11 SHOT ON MI 8 LITE AI DUAL CAMERA 16 X 劉毅主編 X X X X X X OVANCED COM OLO ERIES Lin Lougher + X 2.0 cm X e- LMO X OD Judd Piggott