A parallel-plate capacitor is connected to a battery. After it becomes charged, the capacitor is disconnected from the battery a
1 answer:
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Answer:
n = 1.5
Explanation:
The speed of light in vacuum is 300000000 m/s
The speed of light in glass is 200000000 m/s
We need to find the refractive index of the glass.
We know that, the ratio of speed of light in vacuum to the speed of light in medium is equal to refractive index of the medium.
So, the refractive index of the glass is 1.5.
Answer:
<em>2.15 mV</em>
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Explanation:
The complete question is
You have a coil of wire with 17 turns each of 1.5 cm radius. You place the plane of the coil perpendicular to a 0.50-TB? field produced by the poles of an electromagnet.
Find the magnitude of the average induced emf in the coil when the magnet is turned off and the field decreases to 0 T in 1.9 s .
Radius of the coil = 1.5 cm = 0.015 m
number of turns = 17
Initial magnetic field = 0.50 T
Final magnetic field = 0 T
time taken dt = 1.9 s
Area pf the coil = π = 3.142 x
= 7.1 x 10^-4 m^2
magnetic flux = BA
initial flux = A = 0.5 x 7.1 x 10^-4 = 3.55 x 10^-4 Wb
Final flux = A = 0 x 7.1 x 10^-4 = 0 Wb
change in flux dФ = 3.55 x 10^-4 - 0 = 3.55 x 10^-4 Wb
Induced EMF E = NdФ/dt = (17 x 3.55 x 10^-4)/2.8 = 2.15 x 10^-3 V
==> <em>2.15 mV</em>