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Nvd1903
2 năm trước
Hai dòng điện có cường độ I1 = 2A, I2 = 4A chạy trong hai dây dẫn thẳng dài vô hạn, đồng phẳng, vuông góc với nhau đặt trong không khí. Trong mặt phẳng chứa hai dòng điện, quỹ tích những điểm tại đó véc tơ cảm ứng từ tổng hợp bằng 0 là đường thẳng(trừ điểm gốc tọa độ O):
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B. READING I. The people below all want to spend a day by the sea. There are descriptions of eight beaches. Decide which beach would be the most suitable for the following people. For questions 22-26 mark the correct letter (A-H) on your answer sheet. Philip and Jenny have two children who cannot swim. Jenny wants them to be able to play safely in the water. Philip wants to team to sail. They need to park near the beach. Marco and Sandra want to spend the day on the beach and have lunch in a café. Marco wants to go surfing, while Sandra wants to relax in the sun. Remi and Claudia want to relax on the beach. Remi would also like to do some sport, while Claudia would like to buy some presents to take home. Richard. Fiona and their seven-year-old daughter want to swim and go for a walk. They would also like somewhere that has a children’s play area, and they plan to buy souvenirs. Paul and Rachel want somewhere with lots of space where they can sit and enjoy the view. Rachel would not manage a difficult walk to the beach. They want to eat lunch in a café. BEACHES A. Hadwick A sandy beach with lots of space and views out to Fishport Harbour. Surfing is nor permitted but swimming is safe and there is a children’s play area and a small shop. The nearest car park is two kilometres away. There are many pleasant walks along the coastal path B. Godstow A narrow beach which is surrounded by high cliffs and is popular tor sunbathing, surfing and sailing. It is safe to swim here. It is next to Winbum Golf Club but there is no car park and me only access is along the coastal path. No café or shopping facilities. C. Amrith A large beach which attracts quite a few visitors but doesn’t get crowded because of its size. There are pleasant views out to sea ond to Bedruth Island. Swimming is safe but surfing is not permitted. There is a café and parking but no shops. D. Torsands A very sheltered beach which is great for sunbathing. It is a popular surfing and sailing beach but swimming is dangerous. There is a café and a children’s play area but there is no car park and visitors have a ten-minute walk across fields. E. Portsea The excellent views make this beach well worth a visit. There are shallow pools which are safe for children to play in. However, there are no roads to the beach and the only access is across fields, though this doesn’t stop some keen surfers. There are no facilities here. F. Holcombe This is a small beach within easy reach of the town centre and its many shops. It is very popular so there isn’t much space. It is next to the Milgrove Golf Club, which is open to the public and has a restaurant. There is no children’s play area, and surfing is not permitted. G. Fishport A small beach which never gets crowded because there are many steep steps down to the beach and there is no car park. There is a small shop but no children’s play area or café. Swimming is good and there are pleasant walks along the coastal path. H. Marple Although unsuitable for surfing, this is a popular boating centre. Swimming is good and the many pools of shallow water are safe for children. Ocean Watersports Centre, which offers lessons in sailing and water skiing, is next to the beach. There is a steep path to the beach from the car park.

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