\(-A.(\)本题供选修\(1-1\)的考生作答\()\) 如图所示,螺线管匝数\(n=1500\)匝,横截面积\(S=20 cm^{2}\),磁感应强度\(B\)的\(B-t\)图象如图所示\(.t=2 s\)时,螺线管的磁通量为_________\(Wb\),\(2 s\)内的感应电动势为_________\(V\). | \(24-B.(\)本题供选修\(3-1\)的考生作答\()\) 如图所示是某电源的路端电压与电流的关系图象,电源的电动势为_________\(V\),电源的内阻为_________\(Ω\). |