The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field
The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in […]
Questions
The capacitance of two concentric spherical shells of radii R₁ and R₂ (R₂>R₁) is
The capacitance of two concentric spherical shells of radii R₁ and R₂ (R₂>R₁) is
Options
(a) 4πε₀R₂ (b) 4πε₀(R₂-R₁)/R₁R₂ (c) 4πε₀R₁R₂/(R₂-R₁) (d) 4πε₀R₁
Correct Answer:
4πε₀R₁R₂/(R₂-R₁)
Explanation:
No explanation available. Be the first […]
The energy required to charge a parallel plate condenser of plate separation d
The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is
Options
(a) ε₀E² […]
What is the nature of Gaussian surface involved in Gauss’s law of electrostatics?
What is the nature of Gaussian surface involved in Gauss’s law of electrostatics?
Options
(a) scalar (b) electrical (c) Magnetic (d) Vector
Correct Answer:
Vector
Explanation:
The Gauss’s law in electrostatics gives a relation […]
Three capacitors 3μF,6μF and 6μF are connected in series to a source of 120V.
Three capacitors 3μF, 6μF and 6μF are connected in series to a source of 120V. The potential difference in volt, across the 3μF capacitor will be
Options
(a) 24V (b) 30V (c) 40V […]
The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ v
The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ volts. The electric field at that point is
Options
(a) 4π?￢ﾂﾀQ x 10²² volt/m […]
An electric dipole placed in a non-uniform electric field experiences
An electric dipole placed in a non-uniform electric field experiences
Options
(a) Both a torque and a net force (b) Only a force but no torque (c) Only a torque but no net […]
what is the electric potential at a distance of 9cm from 3nC?
what is the electric potential at a distance of 9cm from 3nC?
Options
(a) 270V (b) 3V (c) 300V (d) 30V
Correct Answer:
300V
Explanation:
Given, q = 3 nC = 3 × 10⁻⁹ […]
An electric dipole of dipole moment p is placed in a uniform external electric field
An electric dipole of dipole moment p is placed in a uniform external electric field E. Then the,
Options
(a) torque experienced by the dipole is E x p (b) torque is zero, […]
Two equal and opposite charges of masses m₁ and m₂ are accelerated
Two equal and opposite charges of masses m₁ and m₂ are accelerated in a uniform electric field through the same distance. What is the ratio of their accelerations, if their ratio of masses is m₁/m₂=0.5? […]