The EM wave has frequency 870 kHz, electric field amplitude 0.50 V/m, and magnetic field amplitude 1.7 X 10 -9 T.
The antenna is a coil of 50 turns with radius 5.0 cm. In addition, the electric force plays an essential role in maintaining the structure of matter, by keeping the nucleus of the atom together, and by preventing electrically neutral atoms from collapsing into each other. A magnetic dipole antenna is used to detect an electromagnetic wave. The electric force is also responsible for the phenomenon of electricity, including lightning, static electricity, and the flow of electrical current in a conductor such as a wire. The electric force is responsible for maintaining the cohesion of atoms and molecules, and keeping atoms and molecules together, even though electrically neutral atoms tend to repel each other. The electric force is carried by elementary particles called electrons, protons and neutrons. The electric force is one of the four fundamental forces (the others are the strong force, the weak force, and gravity) of nature, and is responsible for a wide range of phenomena, such as the interactions between the components of atoms and molecules, and the formation of molecular bonds and chemical compounds. The electric force plays a major role in determining the internal properties of most objects encountered in daily life.
The negative sign shows the direction of emf that opposes the change in flux or the flow of current.The electric force is a physical force exerted by electrically charged particles, and is the force responsible for a number of phenomena in electromagnetism. Given Data L = 8 H V= 8 Volts R = 2 Ω t = 1 ms = 1 X 10 -3 s e = ? If the applied voltage of the battery is 8 V and it switches off in 1 ms, find induced emf. Solved Problem The inductance of a coil is L =8 H and resistance R = 2 Ω. Here negative sign shows that the induced EMF opposes the rate of change in the current. L is the constant of proportionality. The induced EMF in a coil is proportional to the rate of change of current in a coil. The change in the current produce EMF, therefore the induced EMF always opposes the current. The direction of induced EMF always opposes the very own cause which produces it. We can change the magnitude of the current through a coil by changing the resistance of variable resistance(R). The EMF in a coil changes with a change in current flowing through a coil. The linking flux produces the EMF in a coil. The current I produces flux in a coil and further this flux links to the coil’s own turns. The current I flows through the coil on closing the switch S. We can understand the induced EMF phenomenon using the below diagram.
Thus, the induced emf in the coil depends upon the rate of change of linked flux. The changing flux when linked to a coil turn, it produces EMF in the coil. Self-induced EMF is the electromagnetic force induced in the coil when the current in a coil or conductor changes.
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