Two point charges, \(q_1\) = 10 × \(10^{-8}\)C, \(q_2\) = -2 × \(10^{-8}\)C are seperated by a distance of 60 cm in air what is the electrostatic potential energy of the system.
1) 3 joule
2) -3 joule
3) -3 x\(10^{-5}\) joule
4) 3 x\(10^{-5}\) joule
1) 3 joule
2) -3 joule
3) -3 x\(10^{-5}\) joule
4) 3 x\(10^{-5}\) joule
3 -3.x\(10^{-5}\) joule
If the charge on each plate of a capacitor of 60μF is 3x\(10^{-8}\)C, then energy stored in the capacitor will be
(a) 2.5x\(10^{-15}\)J
(b) 1.5x\(10^{-14}\)J
(c) 3.5x\(10^{-13}\)J
(d) 7.5x\(10^{-12}\)J
Two point charges q and –2q are kept d distance apart. Find the location of the point relative to charge q at which potential due to this system of charges is zero.
Four point charges –Q,-q,2q,2Q are placed at different corners of a square . The relation between Q and q for which the potential at the center of the square is zero
1.Q=q
2.Q=1/q
3.Q=-q
4. Q=-1/q
Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor?
(a) 72 V
(b) 60 V
(c) 48 V
(d) zero
An electric charge of 425 f μC is removed from a fully charged capacitor of capacitance 8.5μF. Its potential will be lowered by:
(a) 75 V
(b) 100 V
(c) 85 V
(d) 50 V
The potential energy of a charged parallel plate capacitor is \(U_0\). If a slab of dielectric constant K is inserted between the plates, then new potential energy will be
(a) \(U_0\)/K
(b) \(U_0\)K²
(c) \(U_0\)/K²
(d) \(U_0\)²
Two conducting spheres of radii \(r^1\) and \(r^2\) are equally charged. The ratio of their potential is
(a) (\(r^1\)/\(r^2\))²
(b) (\(r^1\)\(r^2\))²
(c) (\(r^1\)/\(r^2\))
(d) (\(r^2\)/\(r^1\))
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
What happens to the interference pattern, the two slits S1 and S2 in Young’s double slit experiment are illuminated by two independent but identical sources?
a. The intensity of the bright fringes doubled
b. The intensity of the bright fringes becomes four times
c. Two sets of interference fringes overlap
d. No interference pattern is observed.
A network of resistors is connected to a 16 V battery with internal resistance of 1Ω as shown in the Fig. Compute the equivalent resistance of the network.
(a) 5 ohm
(b) 7 ohm
(c) 9 ohm
(d) 10 ohm
the magnitude of a charge q at the center of two equal and like charges Q so that the three charges are in equilibrium
A. Q
B. Q/2
C. Q/4
D. –Q/4
If a charge q is placed at the center of the line joining two equal charges Q such that the system is in equilibrium, then the value of q is
(A)Q/2
(B)-Q/2
(C)Q/4
(D)-Q/4
An unpolarised beam of intensity \(I_0\) is incident on a pair of nicols making angle of 60° with each other. The intensity of right emerging from the pair is
Huygens theory could not explain
a. Reflection of light
b. Photoelectric effect
c. Interference of light
d. Diffraction of light