- A[M L T-2]
- B[M0 L0 T0 A1]
- C[M L3 T0]
- D[M L2 T-3]
Explanation:
The flow of charge per unit time is defined as current. The fundamental unit of current is Ampere (named after Andre Marie Ampere).
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An electric motor operates on a 50 volt supply and a current of 12A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor
|
(a) 6 Ω |
(b) 4 Ω |
(c) 2.9 Ω |
(d) 3.1 Ω |
A person's near point is 50 cm and his far point is 3 m. Power of the lenses he requires for
(i) reading and (ii) for seeing distant stars are
|
(a) – 2 D and 0.33 D |
(b) 2 D and – 0.33 D |
(c) – 2 D and 3 D |
(d) 2 D and – 3 D |
What type of lens from the following would you have in your magnifying lens to read a page in small print?
The ratio of de-Broglie wavelengths of molecules of hydrogen and helium which are at temperature 27oC and 127oC respectively is
|
(a) |
(b) |
(c) |
(d) 1 |
An electric dipole of moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. It is rotated through an angle θ from the initial position. The potential energy of electric dipole in the final position is
|
(a) pEcosθ |
(b) pEsinθ |
(c) pE(1- cosθ) |
(d) -pEcosθ |
If a unit positive charge is taken from one point to another over an equipotential surface, then
|
(a) Work is done on the charge |
(b) Work is done by the charge |
|
(c) Work done is constant |
(d) No work is done |
The number of electrons to be put on a spherical conductor of radius 0.1m to produce an electric field of 0.036 N/C just above its surface is
|
(a) 2.7 |
(b) 2.6 |
(c) 2.5 |
(d) 2.4 |
At noon the sun appears white because: