What is the unit of "ω" in the formula of alternating current e = NBS ω sin ω t? Is the unit of "ω" rad / S? Then why do some students say that they have to multiply it by a 2 π when doing the problem? For example: ω = 200 rad / s, do they need to change it into ω = 400 π rad / s when doing the problem?

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• 1. As shown in the figure, a circular coil with a radius of R = 10cm has a total of 100 turns and rotates uniformly at a speed of n = 600r / min around the central axis OO 'perpendicular to the direction of the magnetic field in a uniform magnetic field with magnetic induction B = 5 / π 2 & nbsp; t, The timing starts when the coil turns to the neutral plane. (1) write out the instantaneous value expression of the alternating electromotive force generated in the coil. (2) calculate the instantaneous value of the electromotive force when the coil passes 1 / 60s from the position shown in the figure. (3) calculate the average value of the electromotive force when the coil passes 1 / 60s from the position shown in the figure;
• 2. The derivation of the alternating current formula e = 2blvsinwt = bswsinwt in senior two physics,
• 3. How is the maximum value of alternating current EM = NBS ω derived?
• 4. Derivation of several effective value calculation formulas of alternating current Sinusoidal alternating current U = um / √ 2, Sinusoidal half wave alternating current U = um / 2, Sinusoidal unidirectional pulsating current U = um / √ 2, Rectangular pulsating current U = √ (T / T) um, Asymmetric alternating current √ (1 / 2 * (U1 ^ 2 + U2 ^ 2))
• 5. On the formula of alternating current What is the meaning of sin ω t in the formula of alternating current e = e (m) sin ω t? Is it sin ω * t or sin ω t?
• 6. On the homeostasis expression of alternating current When to use EM = coswt, when to use EM = sinwt?
• 7. How to get the image effective value of sine alternating current Is the maximum divided by the root 2 half cycle or one cycle?
• 8. Maximum and effective value of alternating current (sine) The derivation of the relationship between maximum and effective value
• 9. Proving the relationship between the effective value and the peak value of the sinusoidal alternating current by integration Such as the title
• 10. Solution: sine alternating current effective value Emax = root 2E effective, integral derivation process
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• 13. If the gravity of the eraser is known to be 1.5n, the attraction between the eraser and the blackboard is constant 4N. When a thrust of 0.5N is applied to the eraser, the eraser can slide along the blackboard surface at a constant speed. If the eraser is to slide along the blackboard surface at a constant speed, a vertical upward force should be applied. The force is 0.5N___ ___ N．
• 14. It's not my problem. They just do it
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• 19. Teacher's Day is coming, I want to write some blessings to 8 teachers I want to write some blessing words to teachers of 8 subjects Each subject's blessing should be related to the subject's knowledge: for example, mathematics with knowledge, English with English Example: Mathematics (teacher's Day is coming, I wish you happy 365 days a year, 8760 hours, 5256000 minutes, 3153600 seconds) with numbers!
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