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3 years ago

A vector quantity is the magnitude of a given quantity? True Or False

Physics

1 answer:

Anettt [7]3 years ago

6 0

Answer:

false

Explanation:

A vector quantity is the magnitude of a given quantity? True Or False

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Friction can be reduced by using ___________.

allsm [11]

Answer:

Make the surfaces little more smoother. ...

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Make the object more streamlined. ...

Reduce the Normal force acting between the surfaces in contact. ...

Reduce the contact between the surfaces, so that less number of bonds will be formed.

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3 years ago

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A solenoid 0.425 m long has 950 turns of wire. What is the magnetic field in the center of the solenoid when it carries a curren

lesya692 [45]

Answer:

The magnetic field in the center of the solenoid is $7.8\times10^{-3}\ T$ .

Explanation:

Given that,

Length of solenoid = 0.425 m

Number of turns N = 950

Current I = 2.75 A

The magnetic field in the center of the solenoid is the product of the current , number of turns per unit length and permeability.

In mathematical form,

$B = \mu_{0}nI$

Where, $n = \dfrac{N}{l}$

N = number of turns

L = length

I = current

Now, The magnetic field

$B = \dfrac{\mu_{0}NI}{l}$

Put the value into the formula

$B=\dfrac{4\pi\times10^{-7}\times950\times2.75}{0.425}$

$B=\dfrac{4\times3.14\times10^{-7}\times950\times2.75}{0.425}$

$B=7.8\times10^{-3}\ T$

Hence, The magnetic field in the center of the solenoid is $7.8\times10^{-3}\ T$ .

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3 years ago

Starting from zero, an electric current is established in a circuit made of a battery of emf E, a resistor of resistance R and a

igor_vitrenko [27]

Answer:

time constant will decrease and steady state current will decrease on increasing the resistance

Explanation:

As we know that the EMF of cell is E which is used to connected across a resistor and an inductor.

So we will have

$E - iR - L\frac{di}{dt} = 0$

here we know that

$i = \frac{E}{R}(1 - e^{-Rt/L})$

now here we have

$\tau = \frac{L}{R}$

so if we increase the value of resistance of the wire then the time constant will decrease

and hence it will take less time to reach near the steady state value

also the steady state current will be smaller in that case

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Which type of environmental science career involves collecting information about how human events impact the environment?

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3 years ago

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A vector quantity is the magnitude of a given quantity? True Or False​

A vector quantity is the magnitude of a given quantity? True Or False