A 150-g ball containing 4.00 x 10^8 excess electrons is dropped into a 125-m vertical shaft.  At the bottom of the shaft, the ball suddenly enters a uniform magnetic field that has magnitude 0.250 T and direction from east to west.  Ignoring air resistance, find the magnitude of the force that this magnetic field exerts on the ball just as it enters the field.

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Q: 65.0°

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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.