- A$\pi$
- B$\frac{\pi}{2}$
- C$\frac{-\pi}{2}$
- D$\text{Zero}$
Explanation:
Current leads voltage by $\frac{\pi}{2}$
$\therefore$ phase difference is $=\frac{\pi}{2}$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The pressure exerted by an electromagnetic wave of intensity I (watts/m2) on a nonreflecting surface is [c is the velocity of light]
|
(a) Ic |
(b) |
(c) I/c |
(d) |
Which of the following statements is incorrect about hysteresis
|
(a) This effect is common to all ferromagnetic substances |
|
(b) The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material |
|
(c) The hysteresis loop area is independent of the thermal energy developed per unit volume of the material |
|
(d) The shape of the hysteresis loop is characteristic of the material |
Force between two unit pole strength placed at a distance of one metre is
| (a) 1 N |
(b) |
(c) |
(d) 4π |
A coil has an area of 0.05 m2 and it has 800 turns. It is placed perpendicularly in a magnetic field of strength 4
, it is rotated through 90° in 0.1 sec. The average e.m.f. induced in the coil is
|
(a) 0.056 V |
(b) 0.046 V |
(c) 0.026 V |
(d) 0.016 V |