# electric

1. ### Calculating the divergence of electric field using the definition of divergence.

If I try to calculate the divergence of electric field created by a point charge at the origin then I shall do something like this: \mathbf{E}= \frac{1} {4\pi\epsilon_0} \frac{q}{r^2} \hat r \mathbf{\nabla} \cdot \mathbf{E} = \frac{1}{r^2} ~ \frac{\partial (r^2E_r)}{\partial r} +...
2. ### Electric fields

An electron moving to the right at 0.01c enters a uniform electric field. If the electron is to be brought to rest in a space of 4.0 cm, what is the direction and strength of the electric field? I've tried solving using initial energy, the resulting field strength seamed very small, any...
3. ### Troublesome problem with finding the electric current

In this problem we have A wire with resistance per unit length of 32 Ω/m that is bent at a right angle. The second straight fragment of the same wire (The blue one) moves at the top of the first one at a speed of v = 4 m/s. The whole system is located in a magnetic field with an induction of B =...
4. ### Question about relationship between Acceleration and Electric Potential

Hi everyone. Im a Engineering student and i having doubts about this question: "What is the acceleration vector a(x,y,z) of a particle of mass m0 and charge q0 when there is a Potential vector V(x,y,z) = c0 x3 c1 + x-5 y5 z4 where 'c0' and 'c1' are constants." Well I started with the...
5. ### Electric Field for the circular path of positively charged particle

Here is picture. Answers is A. https://ibb.co/m6Bpb2V My attempt was that I thought if i were to place a positive test charge then it would go from top to bottom if there was a positive charge in the center it was avoiding and a positively charged particle at the top, but an...
6. ### Finding the electric field along the line between charges

Hey So I've been asked this question as part of my physics assignment (Its an advanced section question so significantly harder than the normal questions) and I've been stuck, my intuition tells me there should be two zero points, and initially I found a formula that only found one, however...
7. ### Electric flux

Hello sir How to solve this an electric charge of 8.85*10^-13 C is placed at the center of a sphere of radius 1m. The electric flux through the sphere is: 1. 0.2NC ^-1 m² 2. 0.1NC ^-1 m² 3. 0.3NC ^-1 m² 4. 0.01NC ^-1 m²
8. ### Gravitational and Electric fields

Question. The sun exerts a gravitational force of 1.64 x 10^21 N on Mars. Calculate the mass of Mars. [ Mass of the Sun = 1.989 x 10^30 kg. Mean seperation of Mars from the Sun = 2.279 x 10^11 m.] Can anyone help me with this?
9. ### Help electrostatics - electric field(beginner level)

The figure below shows three electric charges q1, q2 and q3 that are located at distances of r1= 2 cm, r2= 2cm and r3= 1cm from the origin of the coordinate system, as shown in the figure. Knowing that θ1 = θ2 = θ3 = 30º, q1=1mC,q2=3mC and q3=-2mC. Consider: 1/4πξº = 9x10 ^ 9 Nm² / C², and...
10. ### Direction of Electric Field lines

Hello, I understand how to get the magnitude for the electric field in this problem. My only issue is that I cannot figure out why the i coordinate is -sin while the j coordinate is -cos. I had the problem entirely right except I had cos in the i spot and sin in the j spot. I'm sure this is a...
11. ### Electric field, in the vertices of a triangle

in triangle ABC there are charges qa =-1.7X10-7C and qb =5.3X10-7. Find the intensity of the electric field in the vertex C
12. ### Electric field in conductive solutions

Goodmorning everyone, i'm knew to the forum (so please excuse me if i make obvious mistake) and i mainly joined in the hope to find some help with a question that i have on electric field. Due to some experiment i'm doing i found my self looking for some theoretical prediction of the...
13. ### Electric field strength between two rings:

Hi to everyone! I'm here to ask how could you resolve this problem about electric fields: two charges q1= 1.88*10^-8 and q2=-7.54*10^-8 are evenly distributed on two rings with the same radius R=30 cm, positioned above two parallel planes, far each other d=3mm. We have to calculate the strength...

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15. ### Net Electric Fields

I keep getting this problem wrong- Two charges, q1 = −3.00 mC and q2 = 4.50 mC, are located at −2.00 cm and 3.00 cm on the x axis, respectively. What are the magnitude and direction of the resulting field at (a) x = −3.00 cm? (b) x = 0 cm? (c) x = 5.00 cm? My physics book doesn't bother...
16. ### Electric Fields

Can anyone explain how to find electric fields caused by multiple charges at a specified position? I keep getting wrong answers when I try to do those problems, if someone could just break down how to go about them it'd be a big help! Thanks!
17. ### Finding Charge given expression for Electric Potential

Hi, I'm having some trouble with a problem I have regarding electric potential. I'm given the equation for the electric potential everywhere on the xy plane. V=(22/√((x+1.54)^2+y^2))-(38/√(x^2+(y-2.77)^2)) There are two particles which I need to find the charge and coordinates for. I...
18. ### Electric flux

Hello buddies! Фe = CU Фe - electric flux; C - capacitance; U - potential difference (electromotive force). Is this formula valid (correct)? If the answer is YES, under what specific circumstances it is valid? I will be thankful for every comment and explaining... Wish you a...
19. ### D (electric displacement field)

Hello, guys!! Does an infinitesimal change in D (electric displacement field) change the rate of change of l with x ? If the answer is YES, can you, please, write the correct mathematical expression of this?
20. ### Why is the electric field inside the dielectric cancelling?

So, I was studying force between the plates of a capacitor when a dielectric is inserted. Here is my question https://ibb.co/cenvXk Shouldn't it be like this picture below https://ibb.co/kOUsCk So, why is my teacher saying that the electric field inside the dielectric cancelling...