It is b. sodium because it is in group 1
The EMF induced in the second coil is 43 Volts.
Michael Faraday was the first to discover electromagnetic induction back in the 1830s. Faraday discovered that moving a permanent magnet in and out of a coil or a single loop of wire caused an electromotive force, or EMF—otherwise known as a voltage—to be produced.
Changing magnetic flux results in varied currents flowing through the coil, which in turn generates its own magnetic field. This self-induced EMF opposes the change that is creating it, and the stronger the opposing EMF is, the faster the rate at which the current is changing. According to Lenz's law, this self-induced EMF will oppose the change in current in the coil, and because of its orientation, it is typically referred to as a back-EMF.
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Answer: 140
Explanation: just multiply 7 x 20
Answer:
a) 17 N
b) 21 N
Explanation:
At the 3 o'clock position, the sum of the forces towards the center is:
∑F = ma
T = m v² / r
19 = m v² / r
At the 12 o'clock position, the sum of the forces towards the center is:
∑F = ma
T + mg = m v² / r
T + (0.18)(9.8) = 19
T = 17.2 N
At the 6 o'clock position, the sum of the forces towards the center is:
∑F = ma
T − mg = m v² / r
T − (0.18)(9.8) = 19
T = 20.8 N
Rounding to two significant figures, the tensions are 17 N and 21 N.
