Which formula is used to calculate electrostatic force and elect

1.

1. In a uniform electric field, a point of charge is moved from point a to point B, and the distance between two points a and B along the direction of field strength is set as D. now, q is moved from a to B along three different paths. It can be proved that the work done by the electric field force WAB = QED, that is, the work done by the electric field force has nothing to do with the path of the moving charge

(1) the formula w = f · s · cos θ This formula is only suitable for uniform electric field and can be deformed to w = QE · s ·

(2) calculated by w = Qu, this formula is applicable to any form of electrostatic field. When w = Qu is used to calculate the work of electric field force, the sign of Q and u can be substituted together to calculate the positive and negative of W, or only the absolute value of Q and U. then the positive and negative of work can be judged according to the nature of charge, the direction of electric field force and the moving direction

extended data

electric field has the nature of force and energy. The physical quantities describing electric field include electric potential, electric potential energy, electrostatic force, electrostatic force work, etc. in order to better describe electric field, electric field line, equipotential surface and other concepts can be used to judge the electric potential from multiple angles&# 8194;

The potential along the direction of the electric field line is lower and lower&# 8194;

In the electric field generated by positive charge, the closer to the charge, the higher the potential; in the electric field generated by negative charge, the closer to the charge, the lower the potential

If the potential at infinity is zero, the potential around the positive point charge is positive and that around the negative point charge is negative&# 8194;

According to the movement of charge only under the action of electrostatic force. Only under the action of electrostatic force, the charge starts to move from static, and the positive charge always moves from the point with high potential to the point with low potential; The negative charge always moves from the point with low potential to the point with high potential. But they all move from the point with high electric potential energy to the point with low electric potential energy

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3.

I once bought a virtual currency. After the price rose, and I have made some profits, I sold it out in time . Now I no longer hold a virtual currency

the mood after purchasing virtual currency is very complicated. On the one hand, it can make you feel very exciting, on the other hand, it can also make you face the possibility of loss. Fortunately, I chose doggie coin among the virtual currencies I bought and earned about 2000 yuan

First, we should learn to stop the surplus in time< p> In fact, the reason of purchasing virtual currency is the same as that of purchasing stock, because both virtual currency and stock have the possibility of being manipulated. Since the price is likely to rise significantly in a short period of time, it is also likely to fall significantly in the future, what we need to do is to sell our virtual currency before it falls{ RRRRR}

in my week, more than 50% of people have lost money when they buy virtual currency. The most important point in purchasing virtual currency is actually the time to buy and the time to sell< many people, after making a certain profit, did not sell in time, but continued to wait for the price to rise, resulting in a loss

4. Take Metro Line 2 / 4 to Hongshan Square Station, take exit A2 to Hongshan gymnasium bus station on Minzhu Road, take No.14 to Donghu station on Huanhu Road, and then walk to the Yangtze River Hall of Donghu International Conference Center

5.

bus line: Rail Transit Line 4 → 701, the whole journey is about 20.0km

1. Walk about 960m from Hanyang District to Shilipu station

2. Take rail transit line 4, pass 11 stops, reach Hongshan Square Station

3. Walk about 380m, reach Hongshan Road Station

4. Take 701, pass 6 stops, reach Huanhu road Donghu station

5. Walk about 300m, Arrive at Wuhan East Lake International Conference Center

6. This hotel is one of the best I have stayed in ring my tour. Wuhan is the terminus of my trip. I ordered to the East Lake International Conference Center through internal help. Late at night to the hotel, the hotel in a very deep place, driving lost many times. Into the garden of the hotel, found that the environment is very good. The lobby is quite elegant, in line with the Oriental aesthetic, and uses the decoration style with Hubei characteristics, which is very elegant. The room is really speechless. It's very big. A double standard room is as big as a small suite. The room is also equipped with computer and network. There are large French windows, you can see the scenery of East Lake and East Lake Hotel in the daytime. The garden here is just a bridge away from the East Lake Hotel. It's owned by one family. The garden on one side of the East Lake Hotel is lush and quiet. It is close to the East Lake for a walk. The scenery is excellent. There is also a battery car in the hotel. All places in the hotel can be delivered. The service attitude of all hotel staff is very good. There is no shelf in the state-owned hotel. The breakfast room is small and the dishes need to be improved. Everything else is good and worth a special trip.

7.

bus route: no.363, the whole journey is about 1.5km

1. Walk about 200m from the East Lake International Conference Center to the East Lake Hotel Station

2. Take no.363, pass by 1 stop, and reach Buxin Garden Station

3. Walk about 480m to Tai'an

8. Wuhan station takes subway line 4 to Yuejiazui station, walk to Liyuan square, and walk along the East Lake Tingtao Scenic Spot to the conference center. You can also take bus 413 at Yuejiazui bus station to the Provincial Museum Station, and walk along Huangli road to the conference center. Please accept!

9.

bus route: No.14 → Rail Transit Line 2 → airport bus line, the whole journey is about 42.7 km

1. Walk about 530 meters from Wuhan East Lake International Conference to Huanhu Road East Lake Station

2. Take No.14, pass 6 stops to Hongshan Road Station (or take No.701)

3. Walk about 330 meters to Hongshan Square Station

4 Take Rail Transit Line 2, after 10 stops, to Hankou railway station

5, walk about 640 meters, to jinjian passenger station

6, take airport bus line, after 1 stop, to Tianhe Airport Station

7, walk about 930 meters, to Wuhan Tianhe International Airport