Share Answer A d.c generator is one in which its current is allowed to flow in one direction even through it may vary in value an a.c generator can only be made to produce a d.c by replacing the two slip rings with a single split ring or commutator.

Share Answer For capacitance i n parallel, 2F and 2F are in parallel,
their equivalence is 2F and 2F = 4F

The 4F generated is now in series with the remaining 4F.

The net capacitance for series connection is

\(\frac{1}{C}\) = \(\frac{1}{4}\) + \(\frac{1}{4}\) = 1 + \(\frac{1}{4}\) = \(\frac{2}{4}\)

C = \(\frac{4}{2}\)

= 2F

Share Answer Barometer is used to measure atmosphere pressure
Thermometer is used to measure temperature
Hygrometer is used to measure relative density of a liquid
Manometer is used to measure the pressure of a gas

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Power is the time rate of doing work

i.e power = \(\frac{\text{energy}}{\text{time}}\)

Since energy = mgH

power = \(\frac{mgH}{t}\)

= \(\frac{50 \times 10 \times 5}{t}\)

= 500W

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V = f

= \(\frac{v}{f}\)

= \(\frac{3 \times 10^8}{600 \times 10^3}\) = 500m

= 5 \(\times\) 10²m

N.B 600KHz Frequency = 600 \(\times\) 10³Hz

Share Answer Scalar quantity is a quantity with only magnitude, it has no direction
Tension, weight, impulse are vector quantities because they have direction. Mass is the only scalar quantity there

Share Answer Power of a lens = \(\frac{1}{f}\)

f = focal length

f = \(\frac{1}{p}\)

= \(\frac{1}{5}\)

= 0.2m

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From Hoke's Law, F = ke, K = Constant of Force

For he first case, Force = mg,

= 0.8 \(\times\) 10 = 8N

8 = k \(\times\) 0.04

k = \(\frac{8}{0.04}\)

= \(\frac{200N}{m}\)

Since K is constant

For the second case, F = ke

F = 200 \(\times\) e

e = \(\frac{F}{200}\)

= \(\frac{16}{200}\)

= 0.08m

Share Answer Eddy currents are produced by the varying flux cathode, the iron core of an equipment thus reducing efficiency due to power consumption. It can be reduced by laminating the core by breaking up the path of eddy current or by increasing the resistance of the core
Usage of insulated soft iron wire is to reduce hysteresis loss
Usage of low resistance wire (thick wire) is to reduce I2R loss
Usage of thick wire is to reduce leakage heat loss due to leakage of magnetic flux
Thus the correct answer is to use high resistance wire or thin wire

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c = 8F, v = 10v

Energy stored = \(\frac{1}{2}\) cv²

= \(\frac{1}{2}\) \(\times\) (8 \(\times\) 10^-6) \(\times\) 10²

= 4 \(\times\) 10\(^{-4}\)