Đường sức từ của từ trường gây ra bởi dòng điện?

A. thẳng là những đường thẳng song song với dòng điện

B. tròn là những đường tròn

C. tròn là những đường thẳng song song cách đều nhau

D. trong ống dây đi ra từ cực Bắc, đi, vào từ cực Nam của ống

Choose the letter A, B, C or D to answer these following questions

My name is Ezaz Ulhaq. I am 7 years old. Now I’m studying at a primary school. I was born and raised in Sialkot; a city in the north of Pakistan. If you haven’t heard of Pakistan, it is a country located in subcontinent Asia. It is a neighbor to Afghanistan, China, India and Iran.

The country has an inspiring beauty. We have all kinds of weather and topography from beaches to snow peaked mountains, lush green fields and lakes. Our country is known for sparkling rivers and hot deserts. I really love my country.

Question: Which weather does the country have?

A. It has the hot weather.

B. It is snowy and cold.

C. It has all kinds of weather.

D. It is very hot.