Which of the following figures represent the
variation of particle momentum and the associated
de-Broglie wavelength ?

A wire carrying current I has the shape as shown
in adjoining figure. Linear parts of the wire are very
long and parallel to X-axis while semicircular portion
of radius R is lying in Y-Z plane. Magnetic field at
point O is :

Consider 3rd orbit of He⁺ (Helium), using non-relativistic approach, the speed of electron in this orbit will be given K = 9×10  constant, Z=2 and h (Planck's Constant) = 6.6×10^-34 Js]

A potentiometer wire has length 4 m and resistance
8Ω. The resistance that must be connected in series
with the wire and an accumulator of e.m.f. 2V, so
as to get a potential gradient 1 mV per cm on the
wire is :

On observing light from three different stars P, Q
and R, it was found that intensity of violet color is
maximum in the spectrum of P, the intensity of green
colour is maximum in the spectrum of R and the
intensity or red colour is maximum in the spectrum
of Q. If T_P, T_Q and T_R are the respective absolute
temperatures of P, Q and R, then it can be
concluded from the above observation that :

Across a metallic conductor of non-uniform cross
section a constant potential difference is applied.
The quantity which remains constant along the
conductor is :