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3 years ago

The magnitude of the electric current is directly proportional to the _____________ of the electric field.

Physics

2 answers:

MatroZZZ [7]3 years ago

8 0

Answer;

the potential difference

The magnitude of the electric current is directly proportional to the potential difference of the electric field

Explanation;

An electric current results from the collective movement of free charges under the effect of an electric field. An electric field exists and can be observed in the space around a single charge or a number of charges.

Electric fields cause charges to move. It stands to reason that an electric field applied to some material will cause currents to flow in that material. In other words, the current density is directly proportional to the electric field. The constant of proportionality σ is called the material’s conductivity.

I am Lyosha [343]3 years ago

6 0

The Magnitude of the electric current is directly proportional to the voltage of the electric field.

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3 years ago

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3 years ago

A marble, rolling with speed of 20m/sec rolls off the edge of the table that is 180m high (g=10m/sec2), find time taken to drop

natali 33 [55]

Answer:

Choice: c. 6sec

Explanation:

Horizontal Launch

When an object is thrown horizontally with a speed (v) from a height (h), it describes a curved path ruled by gravity until it finally hits the ground.

The horizontal component of the velocity is always constant because no acceleration exists in that direction, thus:

$v_x=v$

The vertical component of the velocity changes in time because gravity makes the object fall at increasing speed given by:

$v_y=g.t$

Where $g=10 m/s^2$

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$\displaystyle t=\sqrt{\frac{2h}{g}}$

The marble rolls the edge of the table at a height of h=180 m, thus:

$\displaystyle t=\sqrt{\frac{2*180}{10}}$

$\displaystyle t=\sqrt{36}$

t = 6 sec

Choice: c. 6sec

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3 years ago

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