In the circuit below, the switch has been in the open position for a long time. At t=0, the switch is turned on. If the current at time t=1.1 ms reaches 75% of its maximum value, R=25 Ω, and ℰ=15 V, find: the maximum value of the current, Imax=  A. the time constant τ=  ms, the inductance L=  mH. If the switch is open again, after what time, the current will reach 25% of its value? t1/4=  ms.

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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.