Physics, 31.08.2020 01:01 jeanette7482

g a long, straight wire carries a current an electron Is it necessary to include the effects of gravity?

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Answer from: lbelle

The force is $3.2\times10^{-20}\ N$

Explanation:

Given that,

A long, straight wire carries a current.

Suppose, a long, straight wire carries a current 0.86 A. An electron is traveling in the vicinity of the wire. At the instant when the electron is 4.50 cm from the wire and traveling at speed of $6\times10^{4}\ m/s$ directly toward the wire. What are the magnitude of the force that the magnetic field of the current exerts on the electron?

We need to calculate the magnetic field

Using formula of magnetic field

$B=\dfrac{\mu_{0}I}{4\pi r}$

Where, I = current

r = distance

Put the value into the formula

$B=\dfrac{4\pi\times10^{-7}\times0.86}{2\pi\times4.5\times10^{-2}}$

$B=0.0000038\ T$

$B=3.8\times10^{-6}\ T$

We need to calculate the force

Using formula of force

$F=qvB\sin\theta$

Here, $\theta=90^{\circ}$

Where, q = charge of electron

v = velocity of electron

B = magnetic field

Put the value into the formula

$F=1.6\times10^{-19}\times6\times10^{4}\times3.8\times10^{-6}\sin90$

$F= 3.2\times10^{-20}\ N$

Hence, The force is $3.2\times10^{-20}\ N$

Answer from: Quest

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Answer from: Quest

Answer

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

explanation

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

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