a conducting rod is moved to the right on a U- shaped conductor in a uniform magnetic field. Suppose that the length of the moving rod is l = 0.2 m, its speed is v + 0.1 m/s, the magnetic field strength is B = 1.0T (directed into the page) and the resistance of the circuit is R = 0.0200. (a) Determine the direction of induced current. (a) Calculate the induced emf of the circuit. (b) Find the magnitude and direction of the induced current of the circuit. (c) Calculate the external power is needed to move the rod at constant velocity​

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia