A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will
(A) Increase four times
(B) be reduced to half
(C) remain the same
(D) Be doubled
(A) Increase four times
(B) be reduced to half
(C) remain the same
(D) Be doubled
(C) remain the same
Electric flux emanating through a surface element placed in an electric field is
(A) 10 units
(B) 20 units
(C) 4 units
(D) 16 units
A charge q is placed at one corner of the cube. The electric flux passing through any one of its face is
In the process of charging, the mass of the negatively charged body-
(A) Increases
(B) Decreases
(C) Remains Constant
(D) None of the above
Charge in motion within the Gaussian surface gives changing physical quantity
(A) Electric field
(B) Electric flux
(C) Charge
(D) Gaussian surface area
A glass rod acquires charge by rubbing it with silk cloth. The charge on glass rod is due to :
(A) Friction
(B) Conduction
(C) Induction
(D) Radiation
A point charge +Q is placed in the vicinity of a conducting surface. Draw the electric field lines between the surface and the charge.
The distance between two-point charges is increased by 10%. The force of interaction approximately
(A) Increased by 10%
(B) Decrease by 10%
(C) Decrease by 17%
(D) Decrease by 21%
In a region of constant potential,
(a) the electric field is uniform
(b) the electric field is zero
(c) there can be no charge inside the region
(d) the electric field shall necessarily change, if a charge is placed outside the region
In a meter bridge as shown, the balance point is found to be at 39.5 cam from the end A, when the resistor Y is of 12.5 Ω. Determine the balance point of the bridge above if X and Y are interchanged.
(a) 8.2 Ω, 40.6 cm
(b) 8.2 Ω, 60.4 cm
(c) 6.2 Ω, 60.4 cm
(d) 6.2 Ω, 39.6 cm
The main condition for diffraction to be observed is
a. Size of obstacle should be much smaller than the wavelength of the wave.
b. Size of obstacle should be much larger than the wavelength of the wave.
c. Size of the obstacle should be comparable to the wavelength of the wave.
d. For any size of the obstacle.
Twenty-seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop ?
(a) 180 V
(b) 90 V
(c) 120 V
(d) 45 V
Polaroid glasses is used in sun glasses because :
a. It reduces the light intensity to half on account of polarization
b. It is fashionable
c. It has good colour
d. It is cheaper
The phenomenon of diffraction can be treated as interference phenomenon if the number of coherent sources is:
(A) one
(B) two
(C) zero
(D) infinity
A coil of wire of certain radius has 500 turns and self inductance of 75 mH. The self inductance of a second similar coil of 600 turns will be
(a) 100 mH
(b) 150mH
(c) 108 mH
(d) 105mH