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nordsb [41]
3 years ago
14

A white dwarf in a binary system suddenly flares, but in a few months it settles back to its original luminosity. This process m

ay repeat many times. What object is it?
Physics
1 answer:
Anvisha [2.4K]3 years ago
4 0

Answer:

A Pulsar

Explanation:

Such white dwarf is a Pulsar (from pulsating star). Three main features we find in this kind of celestial body

1. Incredibly high density, in a pulsar there is not what we can define as free interspace. Everything is mass

2.- Huge rotational speed (more than hundreds of kilometer) spinning at more than hundreds of kilometer per second

3.-Intense magnetic field

Combinations of thse features make pulsar emits important amount of energies with pricese periods of time. And if on earth we look a jet of electromagnetic radiation with a precise rigurosity (at pricese period of time) is because we are looking a pulsar spinning and each time the radiation appears is a turn of the pulsar

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Name 2 things centripetal force acts on.
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When the current in a toroidal solenoid is changing at a rate of 0.0240 A/s , the magnitude of the induced emf is 12.4 mV . When
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Answer:

The number of turns in the solenoid is 230.

Explanation:

Given that,

Rate of change of current, \dfrac{dI}{dt}=0.0240\ A/s

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The induced emf through the solenoid is given by :

\epsilon=L\dfrac{dI}{dt}

or

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The self inductance of the solenoid is given by :

L=\dfrac{N\phi}{I}.........(2)

From equation (1) and (2) we get :

\dfrac{\epsilon}{(di/dt)}=\dfrac{N\phi}{I}

N is the number of turns in the solenoid

N=\dfrac{\epsilon I}{\phi (dI/dt)}

N=\dfrac{12.4\times 10^{-3}\times 1.5}{0.00338 \times 0.024}

N = 229.28 turns

or

N = 230 turns

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