- Aonly electric field
- Bonly magnetic field
- ✓both electric and magnetic field
- Dnone of electric and magnetic field
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A spectral line λ = 5000 Å in the light coming from a distant star is observed as a 5200 Å. What will be recession velocity of the star
|
(a) 1.15 |
(b) 1.15 |
(c) 1.15 |
(d) 1.15 km/sec |
To obtain P-type Si semiconductor, we need to dope pure Si with
|
(a) Aluminium |
(b) Phosphorous |
(c) Oxygen |
(d) Germanium |
The self inductance of a straight conductor is
|
(a) Zero |
(b) Very large |
(c) Infinity |
(d) Very small |
A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be
|
(a) 99995 |
(b) 9995 |
(c) |
(d) |
The magnifying power of a simple microscope can be increased if we use an eyepiece of: