Một dây dẫn tròn mang dòng điện 20 A thì tâm vòng dây có cảm ứng từ 0,4π μT. Nếu dòng điện qua giảm 5 A so với ban đầu thì cảm ứng từ tại tâm vòng dây là:

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• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others:
• Choose one word whose underlined part is pronounced differently from the others: