long, straight, and closely-wound solenoid shown in the figure below has length L = 0.580 m, 450 turns of wire and the radius of each turn is R = 1.50 cm. The solenoid is connected to a 64.0-V battery and the current I in the solenoid is 6.90 A. What are the magnitude of the resultant magnetic field at a point inside the solenoid, near the center (point P)?

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Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.