A parallel plate capacitor having cross-sectional area A and separation d has air in between the plates.Now, an insulating slab of same area but thickness d / 2 is inserted between the plates as shown infigure having dielectric constant K(= 4). The ratio of new capacitance to its original capacitance will be
A sound wave has frequency of 5kHz and wavelength 50 cm. Then distance travelled by sound in 4sec. (in km ) will be
Two particles of equal masses have velocities v1→=4i^ms−1and v2→=4j^ms−1. First particle has an acceleration a1→=(2i^+2j^)ms−2while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path of
The elements Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?
A sample of calcium carbonate (CaCO3) has the following percentage composition : Ca = 40%, C : 12%, O = 48%. If the law of constant proportions is true, then the weight of calcium in 4 g of a sample of calcium carbonate obtained from another source will be :
Why is Zimbabwe not considered a democratic country i) Because it has mono-party system where elections are always won by Zanu. ii) Freedom of Speech and expression is restricted and dissent is not allowed. iii) Freedom of speech and expression is not restricted and dissent is allowed. iv) The mass media is controlled by the government and is censored.