Physics, 26.02.2020 23:16 NotCJ126

A +20-nC point charge is placed on the x axis at x = 2.0 m, and a –25-nC point charge is placed on the y axis at y = –3.0 m. What is the direction of the electric field at the origin?

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Answer from: athenadailey8717

Explanation:

Formula for the field at the origin due to the point charge at x-axis is represented as follows.

$E_{x} = \frac{1}{4\pi \epsilon_{o}}(\frac{q_{1}}{r^{2}}$

Putting the given values into the above formula as follows.

$E_{x} = \frac{1}{4\pi \epsilon_{o}}(\frac{q_{1}}{r^{2}}$

= $\frac{1}{4 \times 3.14 \times 8.85 \times 10^{-12}}(\frac{20 \times 10^{-9}}{(2)^{2}}$

= 44.981 N/C

This field is towards negative x-axis as field from positive charge are in a direction outwards from them. Hence, expression for this electric field will be written as follows.

$\vec{E}_{1} = -\vec{E_{x}}\hat{i}$

= $-44.981\hat{i}$

Now, field present due to the charge present at negative y-axis field at the origin is as follows.

$E_{-y} = \frac{1}{4 \pi \epsilon_{o}} \times \frac{25 \times 10^{-9}}{9}$

= $\frac{25 \times 1000}{1000.404}$

= 24.989 N

From negative charge, the field towards negative y-axis is as follows.

$\hat{E_{2}} = -E_{-y}\hat{j}$

= $-24.989\hat{j}$

Now, the net field at the origin is as follows.

$\vec{E_{n}} = \vec{E_{1}} + \vec{E_{2}}$

= $-44.981\hat{i} - 24.989\hat{j}$

Hence, the direction of net field is w.r.t to x-axis is as follows.

$\theta = tan^{-1}(\frac{E_{x}}{E_{y}})$

= $tan^{-1}(\frac{24.989}{44.981})$

= $29.054^{o}$ w.r.t negative x-axis

Therefore, we can conclude that the direction of the electric field at the origin is negative x-axis.

Answer from: Quest

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.

Answer from: Quest

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.

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A +20-nC point charge is placed on the x axis at x = 2.0 m, and a –25-nC point charge is placed on t...

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