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A DC battery can pass current continuously through?
- I only
- I and II only
- I and III only
- I, II and III
I and III only
DC current cannot flow through a capacitor continuously because of the presence of an insulating medium between the plates of the capacitor.
A solenoid is to be designed to give B= 8pi T and maximum current 10 A. What should be the turns per unit length for that solenoid?
- 2 * 104
- 2 * 106
- 4 * 104
- 4 * 106
2 * 106
B = µ0nl;
8pi = 4pi * 10-7 * n * 10 gives n = 2 * 106
A parallel beam of white light is incident normally on a different grating. It is noted that the second order and third order spectra partially overlap. Which wavelength in third order spectrum appears at the same angle as the wavelength of 600 nm in the second order spectrum?
Note that nλ should be constant.
2 * 600 = 1200
Now 3 * x = 1200, solving gives x = 400nm