When a current passes through a wire whose different parts are maintained at different temperatures, evolution or absorption of heat all along the length of wire is known as
|
(a) Joule effect |
(b) Seebeck effect |
(c) Peltier effect |
(d) Thomson effect |
(d) Thomson effect
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A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is
|
(a) B |
(b) 2 B |
(c) 4 B |
(d) B/2 |
At a certain place the angle of dip is 30° and the horizontal component of earth's magnetic field is 0.50 Oersted. The earth's total magnetic field is
(a) 
|
(b) 1 |
(c) 
|
(d) 
|
A square of side ‘a’ has charge Q at its centre and charge ‘q’ at one of the corners. The work required to be done in moving the charge ‘q’ from the corner to the diagonally opposite corner is
|
(a) Zero |
(b) |
(c) |
(d) |
Which of the following phenomena can explain quantum nature of light
|
(a) Photoelectric effect |
(b) Interference |
(c) Diffraction |
(d) Polarisation |
In the lowest energy level of hydrogen atom, the electron has the angular momentum
|
(a) |
(b) h/ |
(c) h/2 |
(d) |
Dielectric constant for metal is
|
(a) Zero |
(b) Infinite |
(c) 1 |
(d) Greater than 1 |
A highly conducting ring of radius R is perpendicular to and concentric with the axis of a long solenoid as shown in fig. The ring has a narrow gap of width d in its circumference. The solenoid has cross sectional area A and a uniform internal field of magnitude B0. Now beginning at t = 0, the solenoid current is steadily increased to so that the field magnitude at any time t is given by B(t) = B0 + at where α > 0. Assuming that no charge can flow across the gap, the end of ring which has excess of positive charge and the magnitude of induced e.m.f. in the ring are respectively
|
(a) X, A𝛼 |
(b) X, pR2𝛼 |
(c) Y, 𝜋A2𝛼 |
(d) Y, pR2𝛼 |
