Чему равна магнитная индукция магнитного поля, в котором на проводник длиной 2 см действует сила 100 мН, если сила тока в проводнике 20 А?

1) This is a farm. The trees on the farm are big and old. The farm house is old too. Its roof is red and its doors are brown. The farm house is very nice.
2) My pets are a dog and a cat. The dog, Chase, is very big and the cat, Sally, is little. The dog is black and the cat is red and white.
3) I am a boy, my name is Peter. I am eleven. I am in Moscow now. I like Moscow: it is big and green.