https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:magnetism-and-electromagnetism/x0e2f5a2c:magnetism-and-current-carrying-wires/v/oersteds-experiment-magnetic-field-due-to-current 2026-06-29T18:00:57.756067884Z Magnetic field due to current Electric current produces a magnetic field around a wire, demonstrating that electricity and magnetism are fundamentally connected. The magnetic field becomes stronger with greater current and weaker with increasing distance from the wire. Around a straight current-carrying wire, magnetic field lines form concentric circles, and reversing the current reverses the field's direction. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/_9Wtjcdfpdmrk6W8SsSSQqbOEpRaiMpP5mID8Ai14-n-oqHxOkrbbDK_Z8Oy7ciWD3NnEdeBeh8xiRHMBPzFsV4 Magnetic field due to current Electric current produces a magnetic field around a wire, demonstrating that electricity and magnetism are fundamentally connected. The magnetic field becomes stronger with greater current and weaker with increasing distance from the wire. Around a straight current-carrying wire, magnetic field lines form concentric circles, and reversing the current reverses the field's direction. https://cdn.kastatic.org/ka-youtube-converted/V-irinjvhmc.mp4/V-irinjvhmc.mp4 546 Electric generators https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:magnetism-and-electromagnetism/x0e2f5a2c:electromagnetic-induction/v/electromagnetic-induction-faradays-experiments 2026-06-29T18:00:57.756067884Z Electromagnetic induction Electromagnetic induction is the production of an induced voltage or current by a changing magnetic field through a coil. A stationary magnetic field produces no current; only changes in magnetic field induce electricity. Relative motion between a magnet and coil or changing current in a nearby coil creates induction, forming the operating principle of electric generators. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/NqqiT1bEBr3E8VCAILP66QR0fzg5EYVgfUmCVBGaPCmK2xKnTVYJinZK0IdUq0LpVKrW03xP-b2t9KyqcVpY8Qs Electromagnetic induction Electromagnetic induction is the production of an induced voltage or current by a changing magnetic field through a coil. A stationary magnetic field produces no current; only changes in magnetic field induce electricity. Relative motion between a magnet and coil or changing current in a nearby coil creates induction, forming the operating principle of electric generators. https://cdn.kastatic.org/ka-youtube-converted/yU--8Zk57-Y.mp4/yU--8Zk57-Y.mp4 612 Electric generators https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetics/x6679aa2c65c01e53:electromagnetic-induction/e/apply-electromagnetic-induction 2026-06-29T18:00:57.756067884Z Apply: Electromagnetic induction Apply your knowledge of electromagnetic induction in this set of free, standards-aligned practice questions. Emily Cizmas exercise https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetics/x6679aa2c65c01e53:electric-generators/v/right-hand-generator-rule 2026-06-29T18:00:57.756067884Z Right hand generator rule The right-hand generator rule determines the direction of induced current when a conductor moves through a magnetic field. Stretch the right thumb, forefinger, and middle finger perpendicular to each other: the thumb indicates the conductor's motion (force), the forefinger the magnetic field direction, and the middle finger the induced current direction. Reversing the motion or magnetic field reverses the current. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/74-Cm2dMnYL-itbzrgOkbmYGXujZtNWrfWNNLfS2cYWzw1WOz2NACFHRtlbXxhllBBgTf6ylMZccNuDHiwV0-Ed3 Right hand generator rule The right-hand generator rule determines the direction of induced current when a conductor moves through a magnetic field. Stretch the right thumb, forefinger, and middle finger perpendicular to each other: the thumb indicates the conductor's motion (force), the forefinger the magnetic field direction, and the middle finger the induced current direction. Reversing the motion or magnetic field reverses the current. https://cdn.kastatic.org/ka-youtube-converted/OJ9cWa_2bCo.mp4/OJ9cWa_2bCo.mp4 365 Electric generators https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetics/x6679aa2c65c01e53:electric-generators/v/ac-dc-generator 2026-06-29T18:00:57.756067884Z AC and DC generators Rotating a coil in a magnetic field induces an electric current by electromagnetic induction, converting mechanical energy into electrical energy. Fleming's generator rule determines the current direction. In an AC generator, slip rings allow the current to reverse every half rotation. In a DC generator, split-ring commutators reverse connections, maintaining a unidirectional current. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/2L5WSt4D_ubt7YILi7fXDp2WlVlyi5RMKRvaEY3jlRY6Uv_VmXy3rl0PgaQYS7oBq0bEL7bDSp76tlsKCQlIzo8Z AC and DC generators Rotating a coil in a magnetic field induces an electric current by electromagnetic induction, converting mechanical energy into electrical energy. Fleming's generator rule determines the current direction. In an AC generator, slip rings allow the current to reverse every half rotation. In a DC generator, split-ring commutators reverse connections, maintaining a unidirectional current. https://cdn.kastatic.org/ka-youtube-converted/Ylgb8FFMgd4.mp4/Ylgb8FFMgd4.mp4 809 Electric generators https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:electromagnetic-effects/x0e04e0cb682fb793:ac-generator/e/apply-electric-generators 2026-06-29T18:00:57.756067884Z Apply: Electric generators Apply your knowledge of electric generators in this set of free, standards-aligned practice questions. Emily Cizmas exercise