If wavelength in free space is ?0 wavelength in insulator ?, ?r is relative perm

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Question
If wavelength in free space is ?₀ wavelength in insulator ?, ?_r is relative permittivity or insulator and ?_r is relative permittivity or insulator, then
Options
A.
B.
C.
D.

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2. Most of the memory chips in static RAM
Options
A. do not require any supply
B. need 2 V supply
C. need 5 V supply
D. need 12 V supply

6. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally
Options
A. equal
B. different
C. equal or different
D. different but sometimes equal

7. The real part of complex dielectric constant and tan? for a dielectric are 2.1 and 5 x 10^-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is
Options
A. 1.05 x 10^-3
B. 2.1 x 10^-3
C. 5 x 10^-3
D. 1.05 x 10^-2

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