Engineering Physics

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, H_C = 1 × 10⁵ amp/m

    T = 8 K

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

    Transition temperature, T_C = ?

    

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 ...