名問の森の質問です！ ？のところのV1とV2の向きがなぜそうなるか分からないので教えて下さい！

122 電磁気 38 電磁誘導 十分に長い直線導線Lがy軸上 にあり, 1辺の長さ2aの正方形コ イル ABCD が 辺ABをx軸上に, 辺BC を軸に平行にして置かれて いる。 コイルの電気抵抗は R で, コ イルの位置は辺ABの中点Mの座 標xで表す。 装置は真空中に置かれ, 真空の透磁率 μlo とする。 コイルの 自己誘導は無視する。 Foll 導線L に+yの向きに一定電流Iを流し,コイルを一定の速さ で,xy平面上,x軸に沿って導線から遠ざける。コイルがx(a)の 位置を通過するときについて, (1) L による,点A,B での磁場の強さ H1, H2 をそれぞれ求めよ。 (2) コイル全体での誘導起電力の向き (時計回りか反時計回りか)と大 きさVを次の2つの方法で求めよ。 Level (1)★★ (2) (a)★ (b)★ (3)★ Point & Hint 電磁誘導は一般にはファラデーの電磁誘導 の法則に従っている 0 (2) (b) 微小時間⊿tの間の磁束の変化⊿のを調 べる。 といっても, コイルを貫く磁束のはコイ ル内の磁場が一様ではないので(積分しない限 り) 計算できない。 そこで, 変化した部分だけ に目を向ける。 近似の見方も必要。 L D A -2a- M C B (a) 1つ1つの辺に生じる誘導起電力を調べる。 (b) コイルを貫く磁束の変化を調べる。 (3) x=2aのとき, コイルに加えている外力の向きと大きさを求め よ。 (九州大+お茶の水女子大) -V Base 電磁誘導の法則 磁束① = BS V=-N40 4t 一面積S N巻きコイル ※マイナスは磁束の変化を 妨げる向きに誘導起電力 が生じることを表す。 LECTURE (1) A,Bでの磁場は ? I H₁ = 2π (x− a) 2π (x+a) (2a) 直線電流Ⅰのつくる磁場は紙面の裏へ の向きとなり、磁力線を切って進む AD と BCで誘導起電力 V1, V2が図の向きに発生 している。公式V=vBlより V₁ = vμoH₁.2a V2= vμoH22a 2つの起電力が逆向きとなっていることと, H>Hより全体の起電 力は時計回りで (b)微小時間tの間にコイルはx=v4t だ け動き,右の赤色部分で磁束を402 増やし、 灰色部分で4の減らす。 そこで,磁束の変化 40は H2= 40= 40₂ 40₁ =μoH22a4xμoHi・2a4x 2μo lav π (x²-a²) At 符号マイナスは磁束の減少を表している (H) > H2 より定性的にも明らか)。 よっ て, 誘導起電力の向きは、父の向きの磁場 を生じるようにコイルに電流を流す向きで あり、時計回りと決まる。 40=2μoIav V = π (x² - a²) 4t V=V1-V2=2μova (H1-H2)= 2μo Iav π (x²-a²) (3) x=2a より V= 2μo Iv であり、誘導電流 3π えは時計回りに流れ, オームの法則より i = R 38 電磁誘導 2μo Iv 3πR V₁ H₁ v A -x+a H₁ 4x F D 123 H 2 V i V2 A ⊿xは微小なので ③ 磁場はHやHで 一定としてよい。 B H2 4x C i F2 B Iとの向きから, ③ F は引力, F2は反 発力と決めてもよい。

play the piano はtheが要るのに、play baseball ではtheが要らないのはなぜですか？

なんでこの答えになるのですか？ 3の例文のように沢山の野球ファンという名詞の後ろにexcitedがつかないんですか？

Fuji d to 日本品によりに、 の語 http必要ならば適切な形に変えること。 NOT 電車にはたくさんの興奮した野球ファンがいた。 下線部の語は 句を並べかえて英文を完成させなさい。 excited There were (excite / on the train / a lot of/ baseball fans). a lot of 'baseball ponson. the train.

grammar collectionの第11章接続詞のpracticeの答えをしりたいです🙇

n #1 Practice ① 英文中の空所に入る適切な語または語句を選択肢から選びなさい。 1. They are not crazy, () are they fools. 1 or 2 nor 3 both 102 2. Hurry up, ( ) you will be in time for the train. 1 and 2 if 3 or 3. He is always busy ( ) within and outside the country. 4 and both <東邦大) both of 2 the both 3 both plnil vsy and yuuuoo eid ),19tew to vinslq eri vunos 16AT 4. Many students in the class could ( ) locate the country on the map nor name its capital 79V9WOD city. 1 both 2 either 3 longer OHNSON VEL 5. () Bill accepted our offer was a big surprise to us. 1 When 2 If 3 What 7. The waiter asked me ( ) I would like some coffee. 1 if that 3 what glidw 8. He asked me ( 1 whether 4 That 6. His new movie is different from his last one, ( ) it's based on a true story. 1 in that 2 for that 3 of which with which ) she was coming or not. 2 then 3 what 9. I like to go up in the mountains ( 2 when 1 however Point 10. I have known that gentleman () he was a little boy. 1 when 2 from 3 during either 4 but 11. My daughter didn't start to eat ( ) I got home. 1 by 2 of 3 until 12.() she comes, the job will be 1 Until 2 In front of 4 neither finished. ) there is some snow. 3 how 4 which 4 who 4 that 4 since 4 during <新潟薬科大) BATT 3 Because of 4 By the time <近畿大) 105 〈昭和大〉 105 <法政大) 107 < 東京理科大 〉 107 < 広島修道大 > 108 〈立正大〉 108 <中京大 10 <大阪商業大 <新潟薬科

whole gardenはなぜ単数なのですか？

空欄の単語があっているか確認お願いします。

D. Complete made a name contracts diversity recruit players proud goes to show today than in the past. Major League American Major League baseball has more (1) players teams commonly (2)_contracts players from around the world. Meanwhile, there are even more international players in the minor leagues. In the minors, about half of the players who have signed come from countries outside the United States. In fact, two (4) from Spanish-speaking countries were named in the top 100 players of all time, and one player from Japan (5) made a name for himself winning Gold Glove Awards many years in row. That just (6) goes to show that great baseball players do not have to be born professional (3) recruit diversity in the United States.

中学2年英語いろんな疑問文の問題です！！ 何から始まるかもわからないんで、答えだけで大丈夫なので返答よろしくお願いします！💦

4 <Whで始まる疑問文に対する答え方〉 次の疑問文に対する正しい答えをア~キから1つずつ選び,記号で 答えなさい。 (1) When did you call him? (2) Where are you going to play baseball? (3) Who took this picture? (4) Why was she so tired? (5) Whose racket is this? (6) What can you see? In the park. 38 I Kumi did. ( ] ( ) ( ] Because she worked very hard. Last night. I can see a dog. It's mine. It was Kumi.

中学2年英語いろんな疑問文の問題です！！ 何から始まるかもわからないんで、答えだけで大丈夫なので返答よろしくお願いします！💦

1 次の下線部をたずねる文を作りなさい。 □(1) They play baseball on Sundays. □(2) Mark's guitar is by the door. ○ 演習問題10 □(3) Emi gets up at six every morning. □ (4) He's using his brother's bike. さい

(2)の文章構造を教えて欲しいです。 コロンで挿入されている部分が特に分かりません。 if〜は名詞節を導けますか？

One recent Halloween my five-year-old son entered a *pumpkin-decorating contest at his school. He proudly took his entry to his school. It was a wild combination of *carvings, paint and feathers which he had constructed himself. We placed it among the other creative pumpkins witches, a snowman, and even a 5 bubble-gum-blowing pumpkin (wearing a baseball cap. I thought that the judges were going to have a tough time choosing a winner. They must have thought the same thing, because when we returned to the school that evening, we discovered all the pumpkins had been awarded the same black-and- gold ribbon>My son, eagerly looking to see if his entry had won, kept asking me, 10 "Which pumpkin won? Where's the winner?” What could I say? "Well, it looks like everyone won. Look. You got a ribbon, son!" Kids are smart. "Yeah, but who won?" he asked. I could sense his disappointment - and my own. Why have a contest if you're not going to pick a winner? > I understand that the school was trying to convey that everyone had done a great 15 job, but I worry [that (3)ª a different message was sent that losing is a hardship no one O should face 7

②、なんで put 過去形にならないんですか？🙇‍♂️

was sent to the A big present ② 野球の試合は次の日曜日まで延期された。 dade The baseball game was put off until [till] ③その部屋は空っぽであることがわかった。 empty. [find ] next Sunday. [ put off ]