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3 years ago

What is current density?? Tell it's formula pls

1 answer:

8 0

Current Density is the amount of current that a conductor can safely carry without undue heating per cross - sectional area.

Current Density = Current carrying capacity/Area

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The equation to calculate density is D = m/v. For a liquid substance, which item increases as heat is applied?

777dan777 [17]

Answer:

See below

Explanation:

Things generally expand when heated ....so <u>volume increases</u> while mass remains the same .....this will cause the value of density to decrease

6 0

2 years ago

Show explicitly that ▽ . B-0 near a long straight wire carrying a current I. HINT: you may use Cartesian coordinates, but anothe

aivan3 [116]

Answer:

$\bigtriangledown.B=0$ is proved.

Explanation:

The magnetic field in the long current carrying wire is,

$B=\frac{\mu_{0}I }{2\pi r } \phi$

Here, I is the current, B is the magnetic field.

Now, by using cylindrical coordinates for the divergence of B.

$\bigtriangledown.B=\frac{1}{s} \frac{d}{d\phi} B$

Put the value of B in above equation.

$\bigtriangledown.B=\frac{1}{s} \frac{d}{d\phi}(\frac{\mu_{0}I }{2\pi r } \phi)\\\bigtriangledown.B=0$

Hence, it is prove that for a long current I carrying wire magnetic field divergence that is $\bigtriangledown.B=0$ .

7 0

3 years ago

A crate is lifted vertically 1.5 m and then held at rest. The crate has weight 100 N (i.e., it is supported by an upward force o

Rainbow [258]

Answer:

5..No work is being done.

Explanation:

Hello!

Remember that the concept of work is defined as the force required to move a certain body distance, it is calculated as the product of force by distance.

therefore, the work required to raise the box is 150J.

However, the work required to keep the box lifted without moving is zero since although the box has a force due to the weight it does not move.

6 0

3 years ago

Why does a lone pair of electrons occupy more space around a central atom than a bonding pair of electrons?

Inessa [10]

Answer:

The lone pair of electrons occupy more space because the electrostatic force becomes weaker.

Explanation:

When there is a bond pair of electrons in the 2 positively charged the atomic nuclei draw the electron density towards them, thereby reducing the bond diameter.

In the case of the lone pair, only 1 nucleus is present, and the enticing electrostatic force becomes weaker and the intensity of the electrons will be increases. Therefore, the lone pair occupies more space than the pair of bonds.

5 0

3 years ago

A paintball’s mass is 0.0032kg. A typical paintball strikes a target moving at 85.3 m/s.

vekshin1

Answer:

A) If the paintball stops completely the magnitude of the change in the paintball’s momentum is $p=0.273kg*m/s$

B) If the paintball bounces off its target and afterward moves in the opposite direction with the same speed, the change in the paintball’s momentum is $p=0.546kg*m/s$

C) A paintball bouncing off your skin in the opposite direction with the same speed hurts more than a paintball exploding upon your skin because of the strength exerted is twice than if it explodes.

Explanation:

A) We use the formula of momentum $p=mv$ , so we have $p=0.0032kg*85.3m/s=0.273kg*m/s$

B) We use the same formula above, then due we have a change of direction at the same speed, therefore the change in the momentum is the double so

$p=2*0.0032kg*85.3m/s=0.546kg*m/s$ .

C) The average strength of the force an object exerts during impact is determined by the amount the object’s momentum changes. therefore

$F=\frac{\Delta p}{\Delta t}$ , as we don't have any data about the impact time but we know momentum is twice, time does no matter and strength is twice too.

4 0

4 years ago