A current flows through a solenoid with 50 turns of wire per centimeter and a diameter of 10 cm. The solenoid is inserted squarely into a circular loop with a diameter of 50 cm (the axis of the solenoid makes a 90◦ angle with the plane of the loop). If the magnetic flux through the loop is 1.1 × 10−5 Wb, what is the current in the solenoid? [Answer: I = 0.22 A]

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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.