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3 years ago

Why there is no inductive reactance in dc circuits

1 answer:

4 0

when voltage source is connected across an ideal inductor, the current through it is limited by self induced EMF( N.d(phi)/dt).. This EMF opposes its cause by Lenz's law.

When steady dc supply is connected, there is no change of flux and hence no induced EMF is developed and inductive reactance offered to steady DC supply is zero.

At the same time this induced EMF is proportional to rate of change of magnetic flux/voltage, hence the inductive reactance offered is also proportional to frequency of voltage source.

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Which tool would be most useful to identify areas with frequent earthquakes to predict future earthquakes?

enyata [817]

It is a seismograph that would be most useful.

6 0

3 years ago

Darren drives to school in rush hour traffic and averages 28 mph. He returns home in mid-afternoon when there is less traffic an

Gala2k [10]

Answer:

distance between school and home is 21 miles

Explanation:

given data

in rush hour speed s1 = 28 mph

less traffic speed s2 = 42 mph

time t = 1 hr 15 min = 1.25 hr

to find out

distance d

solution

we consider here distance home to school is d and t1 time to reach at school

we get here distance equation when we go home to school that is

distance = 28 × t1 .......................1

and when we go school to home distance will be

distance = 42 × ( t - t1 )

distance = 42 × ( 1.25 - t1 ) ...................2

so from equation 1 and 2

28 × t1 = 42 × ( 1.25 - t1 )

t1 = 0.75

from equation 1

distance = 28 × t1

distance = 28 × 0.75

distance = 21 miles

4 0

3 years ago

If you throw a 5 kg basketball with a force of 10 N, what is the object's acceleration?

77julia77 [94]

Answer:

20m /s2

Explanation:

8 0

3 years ago

Intensity: Radiation of a single frequency reaches the upper atmosphere of the earth with an intensity of 1350 W/m2. What is the

sesenic [268]

Answer:

The right answer is "1010 V/m".

Explanation:

The given values are:

Intensity,

$I=1350 \ W/m^2$

$c = 3.00\times 108 \ m/s$

$\mu_0= 4\pi\times 10^{-7} \ T.m/A$

Now,

The electric field's maximum value will be:

= $\sqrt{2\times u\times c\times I}$

On substituting the values in the above formula, we get

= $\sqrt{2\times 4\times \pi\times 10^{-7}\times 3\times 10^8\times 1350}$

= $\sqrt{32400\times 3.14\times 10^{-7}\times 10^8}$

= $1010 \ V/m$

3 0

3 years ago

Given: g = 9.8 m/s 2 . A small glass of water is placed on carousel inside a microwave oven, at a radius 6.5 cm from the center.

pashok25 [27]

Answer:

0.17 degrees

Explanation:

From the question we are given the following:

acceleration due to gravity = $9.8 \frac{m}{s^{2} }$

radius (r) = 6.5 cm = 0.065 m

time (s) = 9.3 s

angle = ?

we first have to calculate the distance the water moves, and this is the circumference of the microwave

circumference = 2 x π x r = 2 x π x 0.065 = 0.408 m

Now we find the speed with which it moves at

speed = $\frac{distance}{time}$

= $\frac{o.408}{9.3}$ = 0.044

The next step is to find the centripetal acceleration

a = $\frac{v^{2} }{r}$

= $\frac{0.044^{2} }{0.065}$ = 0.03

being a vector quantity, acceleration has direction, the centripetal acceleration is the x component while the y component would be the acceleration due to gravity (g)

A = 0.03 x + 9.8 y

to find the angle we can apply tan θ = $\frac{ 0.03 }{9.8$

θ = 0.17 degrees

7 0

3 years ago