What is the SI unit of electric potential?
(a) J/C
(b) J-C
(c) v-m
(d) J/c-m
(a) J/C
(b) J-C
(c) v-m
(d) J/c-m
(a) J/C
Choose the SI unit of electric potential energy :
(a) Joule
(b) Coulomb
(c) Newton per coulomb
(d) Erg
The electric potential due to point charge 3 nC at distance of 9 cm is
(a) 270 v
(b) 3 v
(c) 300 v
(d) 30 v
Why are electric field lines perpendicular at a point on an equipotential surface of a conductor ?
Electric potential at a distance r from the point charge is proportional to
1. \(r^2\)
2. r-1
3. r0
4. r+1
In an A.C. circuit, Irms and I₀ are related as
(a) Irms = p I₀
(b) Irms = 2 I₀
(c) Irms = I₀/p
(d) Irms =I₀ / 2
A parallel plate capacitor is made by stacking n equally spaced plates connected alternately. If the capacitance between any two plates is C, then the resultant capacitance is
(a) C
(b) nC
(c) (n-1)C
(d) (n+1)C
Charge in motion within the Gaussian surface gives changing physical quantity
(A) Electric field
(B) Electric flux
(C) Charge
(D) Gaussian surface area
An air capacitor is charged with an amount of charge q and dipped into an oil tank. If the oil is pumped out, the electric field between the plates of capacitor will
(a) increase
(b) decrease
(c) remain the same
(d) becomes zero
Two monochromatic light waves of amplitudes 3A and 2A interfering at a point having phase difference of \(60^\circ\). The intensity of light at that point will be
(A) 5\(A^2\)
(B) 13\(A^2\)
(C) 7\(A^2\)
(D) 19\(A^2\)
A deuteron of kinetic energy 50 keV is describing a circular orbits of radius 0.5 m in a plane perpendicular to the magnetic field B . The kinetic energy of the proton that describes a circular orbit of same radius and inside same B is-
(a) 25 kev
(b) 50 kev
(c) 200 kev
(d) 100 keV
In the figure the net electric flux through the area... when the system is in air. On immersing the system in water,the net electric flux through the area