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A coil havingof a resistance of 100 and an inductance of 200mH.
If an alternating voltage, v, givenby v=200sin500t volts is applied across the coil, measure
(a) The circuit impedance,
(b) The current flowing,
(c) The p.d. across the resistance,
(d) The p.d. across the inductance and
(e) The phase angle between voltage and current.
A weakly guiding fibre with a particular graded core index has cut-off V-values for its 2nd, 3rd and 4th modes of 2.5, 3.9 and 5.2, respectively. The core radius is 4 microns, the
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The phenomenon of diffraction was first discovered by Girmaldi. Its experimental study was completed by Newton's and young. The theoretical explanation was first provided by Fresne
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