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After closing the key in above circuit, ...


After closing the key in above circuit, after some time, a glass rod is inserted in the inductor. Will the brightness of bulb . (a) Give answer with reason. Increase (b) decrease or (c) remain same ?

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(c) brightness will remain same because inductance of inductor remains same.
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Thin films, including soap bubbles and oil slicks, show patterns of alternating dark and bright regions resulting from interference among the reflected light waves. If two waves are in phase their crest and troughs will coincide. The interference will be constructive and the aplitude of the resultant wave will be greater than the amplitude of either constituent wave. if the two waves are out of phase, the crests of one wave will coincide with the troughs of the other wave. The interference will be destructive and the amplitude of the resultant wave will be less than that of either constituent wave. at the interface between two transparent media some light is reflected and some light is refracted. * When incident light, reaches the surface at point a, some of the light is reflected as ray R_(a) and and some is refracted following the path ab to the back of the film. *At point b some of the light is refracted out of the film and part is reflected back refracted out of the fiml as ray R_(c) . R_(a) and R_(c) are parallel. However, R_(c) has travelled the extra distance within the film of abc. if the angle of incidence is small then abc is approximately twice the film's thickness. if R_(a) and R_(c) are in phase they will undergo constructive interference and the region ac will be bright if R_(a) and R_(c) are out of phase, they will undergo destructive interference. * Refraction at an interface never changes the phase of the wave. * For reflection at the interface between two media 1 and 2, if n_(1)ltn_(2) the reflected wave will change phase by pi . if n_(1)gtn_(2) the reflected wave will not undergo a phase change. for reference n_(air)=1.00 * if the waves are in phase after refection at all interfaces, then the effects of path length in the film are Constructive interference occur when (n= refractive index) 2t=mlamda//n" "m=0,1,2,3... .. Destructive interference occurs when 2t=(m+1//2)lamda//n" "m=0,1,2,3... Q. The average human eye sees colors with wavelengths between 430 nm to 680 nm. For what visible wavelength will a 350 nm thick n=1.35 soap film produce maximum destructive interference?

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KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION B NUMERICALS (TEXTUAL ILLUSTRATIONS)
  1. A sinusoidal voltage of peak value of 283 V and frequency 50 Hz is app...

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  2. Suppose the frequency of the source in the previous example can be var...

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  3. Suppose the frequency of the source in the previous example can be var...

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  4. At an airport, a person is made to walk through the doorway of a metal...

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  5. Show that in the free oscillations of an LC circuit, the sum of energi...

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  6. A light bulb is rated at 200W for a 230 V supply. Find the resistance...

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  7. A light bulb is rated at 200W for a 230 V supply. Find the peak volta...

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  8. A light bulb is rated at 200W for a 230 V supply. Find the rms curren...

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  9. A inductor of 5 mH is connected to a source of 220 V . Find the induct...

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  10. A lamp is connected in series with a capacitor. Predict your observati...

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  11. A 10muF capacitor is connected to a 230 V, 50 Hz source. Find the capa...

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  12. After closing the key in above circuit, after some time, a glass rod i...

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  13. A resistor of 100 Omega and a capacitor of 250 muF are connected in se...

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  14. A resistor of 100 Omega and a capacitor of 250 muF are connected in se...

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  15. A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applie...

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  16. A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applie...

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  17. A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applie...

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  18. A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applie...

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  19. For one series LCR ac circuit, 200 V, 50 Hz source is connected . Here...

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  20. For one series LCR ac circuit, 200 V, 50 Hz source is connected . Here...

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