A wire, 28 m long, moves at 4.9 m/s perpen- dicularly through a 0.57 T magnetic field. What emf is induced in the wire? Answer in units of V.

A conducting wire shaped in a “U shape” is connected to a  5 ohm light bulb.The 0.8 T external magnetic field is directed into the page as shown.  A conducting bar of length 1.2 m is sliding on the conducting  wire at 2 m/s to the right. What is the induced emf? Hint:  the induced emf is the negative of the change in magnetic flux. The magnetic flux changes because the area of the U shaped wire placed in the magnetic field changes when the conducting wire slides to the right.  Induced emf <=>   emf = -N ∆Φ/∆t∆Φ =∆(BA)= B ∆A =B  ( Af-Ai) Group of answer choices A) 1.92 V B) 0.8 V C) 2.4 V D) 6.8 V   Please show how you solved the question and provide explanations. I am struggling in this section of physics, so I greatly appreciate your guidance.

Shown is a triangular loop of wire in a uniform magnetic field. If the field strength changes from 0.30 to 0.10 T in 50 ms, what is the induced emf in the loop?A. 0.08 V          B. 0.12 VC. 0.16 V          D. 0.24 VE. 0.36 V

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?