Explanation:
If a sphere is rolled on a rough horizontal surface, the force of friction tries to oppose the linear motion and favours the angular motion.
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A coil of wire of resistance 50Ω is embedded in a block of ice. If a potential difference of 210 V is applied across the coil, the amount of ice melted per second will be
|
(a) 4.12 gm |
(b) 4.12 kg |
(c) 3.68 kg |
(d) 2.625 gm |
$2\text{u}\cos\theta$
$\frac{\text{u}}{\cos\theta}$
$\frac{\text{2u}}{\cos\theta}$
$\text{u}\cos\theta$
Magnetic flux in a circuit containing a coil of resistance 2Ω changes from 2.0 Wb to 10 Wb in 0.2 sec. The charge passed through the coil in this time is
|
(a) 0.8 C |
(b) 1.0 C |
(c) 5.0 C |
(d) 4.0 C |
If 
and 
are the electric and magnetic field vectors of E.M. waves then the direction of propagation of E.M. wave is along the direction of
|
(a) |
(b) |
(c) |
(d) None of these |
The material of wire of potentiometer is
|
(a) Copper |
(b) Steel |
(c) Manganin |
(d) Aluminium |
Dual nature of radiation is shown by
|
(a) Diffraction and reflection |
(b) Refraction and diffraction |
|
(c) Photoelectric effect alone |
(d) Photoelectric effect and diffraction |
