- A3 × 109
- B3 × 108
- C1.602 × 10-19
- D2 × 109
Explanation:
1 Coulomb means 3 × 109 Electro Static Unit of charge. Coulomb and ESU are two different units of charge and their conversion formula is necessary. Coulomb is the unit of charge in the SI system and esu is the unit of charge in the CGS system.
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Young’s double slit experiment is performed with light of wavelength 550 nm. The separation between the slits is 1.10 mm and screen is placed at distance of 1 m. What is the distance between the consecutive bright or dark fringes
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(a) 1.5 mm |
(b) 1.0 mm |
(c) 0.5 mm |
(d) None of these |
The sensitiveness of a moving coil galvanometer can be increased by decreasing
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(a) The number of turns in the coil |
|
(b) The area of the coil |
|
(c) The magnetic field |
|
(d) The couple per unit twist of the suspension |
The size of an atom is of the order of
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(a) |
(b) |
(c) |
(d) |
The heat produced by a 100 watt heater in 2 minute will be equal to
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(a) 12 |
(b) 10 |
(c) 6 |
(d) 3 |