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Engineering Physics by S. Mani Naidu

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Solved Problems

1.    The critical field for niobium is 1 × 105 amp/m at 8 K and 2 × 105 amp/m at absolute zero. Find the transition temperature of the element.

 

(Set-2‒May 2008)

Sol: Critical magnetic field at 8 K, HC = 1 × 105 amp/m

    T = 8 K

    Critical magnetic field at 0 K, H0 = 2 × 105 amp/m

    Transition temperature, TC = ?

    images

2.    A Josephson junction having a voltage of 8.50 μV across its terminals, then calculate the frequency of the alternating current. [Planck’s constant = 6.626 × 10‒34 J-sec]

 

(Set-1‒May 2008)

Sol: Voltage across the junction, V = 8.50 μV

                                                  = 8.5 × 10‒6 V

    Frequency ...

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