- A30Hz
- B50Hz
- C60Hz
- D120Hz
Explanation:
In India, the AC mains supply is referred to as single-phase alternating current and corresponds to a voltage of 230 V at a frequency of 50Hz, similar to most European countries. Whereas in the USA, AC mains supply uses 60Hz.
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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20℃ ? The temperature of boiling water is 100℃
|
(a) 6.4 minutes |
(b) 6.3 minutes |
(c) 12.6 minutes |
(d) 12.8 minutes |
An air core solenoid has 1000 turns and is one metre long. Its cross-sectional area is 10 cm2. Its self inductance is
|
(a) 0.1256 mH |
(b) 12.56 mH |
(c) 1.256 mH |
(d) 125.6 mH |
$\lambda_\text{a}>\lambda_\text{f}$
$\lambda_\text{a}=\lambda_\text{f}$
$\lambda_\text{a}<\lambda_\text{f}$
Electrons move at right angles to a magnetic field of 1.5
Tesla with a speed of 6
. If the specific charge of the electron is 1.7
C/kg. The radius of the circular path will be
|
(a) 2.9 cm |
(b) 3.9 cm |
(c) 2.35 cm |
(d) 3 cm |