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igomit [66]
3 years ago
8

Why there is no inductive reactance in dc circuits

Physics
1 answer:
katovenus [111]3 years ago
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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Summerize how friction and inertia act on an object sliding on a flat surface
natta225 [31]
Inertia is when a object in motion will stay in motion or in a standing still state unless acted upon by a unbalancing force.
Friction is when a object slows down because it is rubbing against another object.

If a object is sliding across a surface, theoretically, it would not stop but because it is on a flat surface it would experience friction, this will disperse some of the kinetic energy that it has thus slowing the object down eventually, after some time, to a stop.

Hope this helps! :)
5 0
3 years ago
Which statement best describes the movement of electrical current when a capacitor is used in a circuit?
lukranit [14]

Answer:

The discharge of a capacitor changes the direction of the current

Explanation:

Capacitor is used to store charges. Changing and discharging a capacitor changes the direction of the current.

When a capacitor is charging, current flows towards the positive plate and away from the negative plate. When the capacitor is discharging, current flows away from the positive and flows towards the negative plate, in the opposite direction. During these two processes (charging and discharging), it can be seen that the direction of the current is changed.

Therefore, the discharge of a capacitor changes the direction of the current

5 0
3 years ago
Metals are both good heat conductors and good electrical conductors because of the
Lostsunrise [7]
<h2>Answer:</h2>

<em>Metals are both good heat conductors and good electrical conductors because of the </em><em>looseness of outer electrons in metal atoms</em>

_________________________

Unlike nonmetals that are insulators, most metals are both good heat conductors and good electrical conductors. This is because within a solid metal there is one or more outer electrons in each atom that become detached and can move freely through the solid metal, but <em>what about the other electrons?</em>  Well, the y remain bound to the positively charged nuclei, and bound within the material in almost fixed positions. On the other hand, insulators are material having few, very few or no electrons that are allowed to move freely through  the material.

4 0
3 years ago
Read 2 more answers
Standing on a skateboard and shoot a paintball gun at your friend
alexandr402 [8]

Answer:

ok

Explanation:

5 0
2 years ago
Read 2 more answers
An elevator cab and its load have a combined mass of 1200 kg. Find the tension in the supporting cable when the cab, originally
Nadya [2.5K]

Answer:

10044 N

Explanation:

The acceleration of the cab is calculated using the equation of motion:

v^2 = u^2+2as

<em>v</em> is the final velocity = 0 m/s in this question, since it is brought to rest

<em>u</em> is the initial velocity = 10 m/s

<em>a</em> is the acceleration

<em>s</em> is the distance = 35 m

a = \dfrac{v^2-u^2}{2s} = \dfrac{(0 \text{ m/s})^2-(10 \text{ m/s})^2}{2\times (35\text{ m})} = -1.43\text{ m/s}^2

Since it accelerates downwards, its resultant acceleration is

a_R = g + a

<em>g</em> is the acceleration of gravity.

a_R = (9.8-1.43)\text{ m/s}^2 = 8.37\text{ m/s}^2

The tension in the cable is

T = ma_R = (1200\text{ kg})(8.37\text{ m/s}^2) = 10044 \text{ N}

3 0
3 years ago
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