A string of length L = 2.6 m and mass m = 0.025 kg is fixed between two stationary points, and when the string is played a transverse wave of frequency f = 104 Hz is generated. The wave is vibrating in an unknown harmonic. Randomized Variables:
L = 2.6 m
m = 0.025 kg
f = 104 Hz
Part (a) What is the strings linear density, ρ, in kilograms per meter?
Part (b) If the wavelength is λ = 10.0 cm what is the tension in N?

answer is slate

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the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.

96.77 amp

explanation:

rl = 250/100 = 2.5 ohms.

egl = 250 + (100 × 0.1) + 2 = 262 v.

at 700 r.p.m., eg2 = 262 × 700/1000 = 183.4 v.

if ia is the new current, then eg2 - 2 - (ia × 0.1) = 2.5 ia

which means this will give ia = 96.77 amp.