- A0°
- B45°
- C90°
- D180°
Explanation:
$\text{i}=\text{i}_\text{o}\sin(\omega\text{t}+\frac{\pi}{2})$
current leads voltage by $\frac{\pi}{2}$ i.e., current and voltage differ in phase by 90°
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$\text{v}$
$\frac{\text{v}}{2}$
$2\text{v}$
$\sqrt{2}\text{v}.$
In Bohr's model of hydrogen atom, let PE represents potential energy and TE the total energy. In going to a higher level
|
(a) PE decreases, TE increases |
(b) PE increases, TE increases |
|
(c) PE decreases, TE decreases |
(d) PE increases, TE decreases |
In the circuit shown P ≠ R, the reading of the galvanometer is same with switch S open or closed. Then
|
(a) |
(b) |
(c) |
(d) |

The number of turns in the coil of an ac generator is 5000 and the area of the coil is
. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2
. The peak value of the emf generated is nearly
|
(a) 786 kV |
(b) 440 kV |
(c) 220 kV |
(d) 157.1 kV |
A small bar magnet has a magnetic moment 1.2 A-m2. The magnetic field at a distance 0.1 m on its axis will be : (m0 = 4p × 10–7 T-m/A)
|
(a) 1.2 × 10–4 T |
(b) 2.4 × 10–4 T |
(c) 2.4 × 104 T | (d) 1.2 × 104 T |