I only
II only
III only
I & IV only
Correct answer is B
- Friction depends on the nature of the surfaces in contact
An alternating current can induce voltage because it has
ripple value
varying magnetic field
weaker magnetic field than direct current
high peak value
Correct answer is B
As induced voltage is produced by varying magnetic field. The induced voltage is proportional to the rate of change of magnetic flux linking the coil.
100\(^o\)C
248\(^o\)C
250\(^o\)C
350\(^o\)C
Correct answer is C
t\(_\theta\) - t\(_o\) = 10,
t\(_{100}\) - t\(_o\) = 4
| θ | = | t\(_\theta\) - t\(_o\)
t\(_{100}\) - t\(_o\) |
× | 100 |
| 10
4 |
× | 100 | = | 250°C |
5Hz
6Hz
5.2Hz
25Hz
Correct answer is A
\(V = \frac{Distance}{time}\)
= \(\frac{50cm}{2s}\)
= 25 cms\(^{-1}\).
\(V = f \lambda\)
\(f = \frac{V}{\lambda}\)
\(f = \frac{25}{5}\)
= 5 Hz
A supply of 400V is connected across capacitors of 3μf and 6μf in series. Calculate the charge
8 x 10\(^{-4}\)C
4 x 10\(^{-2}\)C
8 x 10\(^{-3}\)C
4 x 10\(^{-8}\)C
Correct answer is A
| C\(_T\) | = | C\(_1\) × C\(_2\)
C\(_1\) + C\(_2\) |
| = | 3 × 6
3 + 6 |
= \(\frac{18}{9}\) = 2μf
Q = CV
⇒ 2 × 10\(^{-6}\) × 400
⇒ 800 × 10\(^{-6}\)C = 8 × 10\(^{-4}\)C
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