Which one of the following statements is not correct ?
The SI unit of charge is ampere-second
Debye is the unit of dipole moment
Resistivity of a wire of length l and area of cross-section a depends upon both l and a
The kinetic energy of an electron of mass m kg and charge e coulomb, when accelerated through a potential difference of V volt, is eV joule
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-2 – 2016
– Resistance depends on material, length, and area.
– Charge unit is Coulomb (C) or Ampere-second (A·s).
– Debye is a unit for electric dipole moment.
– Kinetic energy gained by a charge ‘e’ accelerated by potential ‘V’ is eV.
– Statement B is correct: Debye (D) is a common unit used to measure the electric dipole moment of molecules.
– Statement D is correct: When a charge ‘e’ is accelerated through a potential difference ‘V’, the work done on the charge is W = V * e. By the work-energy theorem, this work is converted into kinetic energy, so Kinetic Energy = eV.