Answer:
Time will be 19 ms so option (a) is correct option
Explanation:
We have given that mass of wire m = 50 gram = 0.5 kg
Frequency f = 810 Hz
Wavelength = 0.4 m
Velocity is given by

Amplitude is given as d = 6 m
So time 
So option (a) is correct option
Answer:
electric flux = 177.625 N-m²/C
Explanation:
given data
angle = 45°
diameter = 4 m
electric field E = 20 N/C
to find out
electric flux
solution
we know electric flux formula that is
electric flux = E × A × cosθ ..............1
here A is area that is
Area = πd²/4 = π(4)²/4 = 12.56 m²
now put all value in equation 1
electric flux = 20 × 12.56 × cos45
electric flux = 177.625 N-m²/C
Answer:
500÷25=20
so 20 coulombs per second
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Atom is the correct answer.