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Daniel [21]
4 years ago
15

A secondary battery is a battery that A. has been repaired following damage. B. can only be discharged once. C. is supplied with

a fuel. D. can be discharged and recharged.
Physics
1 answer:
bezimeni [28]4 years ago
7 0

Answer:

Batteries produces energies from redox reaction taking place inside them, they are of two types primary and secondary-

  • Primary batteries are disposable, which means we can use it only once.
  • Secondary batteries can be charged again and again once it gets discharge. There are lot of devices which uses rechargeable batteries, the most common example is automobiles. They are economically cheaper.

Hence, according to the question, D is the correct option.

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There are four main types or classes of organic compounds that are found in all living things. These are carbohydrates, lipids, proteins, and nucleic acids. ... All organic compounds contain carbon, usually bonded to hydrogen. Other elements may also be present.

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I need to know if i have this correct
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Explanation:

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A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a uniform magnetic fie
Scilla [17]

Answer:

Induced current, I = 0.5 A

Explanation:

It is given that,

number of turns, N = 20

Area of wire, A=50\ cm^2=0.005\ m^2

Initial magnetic field, B_i=2\ T

Final magnetic field, B_f=6\ T

Time taken, t = 2 s

Resistance of the coil, R = 0.4 ohms

We know that due to change in magnetic field and emf will be induced in the coil. Its formula is given by :

\epsilon=\dfrac{-d\phi}{dt}

Where

\phi=BA

\epsilon=\dfrac{-d(NBA)}{dt}

\epsilon=NA\dfrac{B_f-B_i}{t}

\epsilon=20\times 0.005\times \dfrac{6-2}{2}

\epsilon=0.2\ V

Let I is the induced current in the wire. It can be calculated using Ohm's law as :

\epsilon=I\times R

I=\dfrac{\epsilon}{R}

I=\dfrac{0.2}{0.4}

I = 0.5 A

So, the magnitude of the induced current in the coil is 0.5 A. Hence, this is the required solution.

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