Physics Test - 2

Charges Q are placed at the ends of a diagonal of a square and charges q are placed at the other two corners. The condition for the net electric force on Q to be zero is

Two charges 5 × 10^-8C and -3 × 10^-8C are located 0.16 m apart. At what point (s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.

An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of the wires are in the ratio 4/3 and radius of the wires are in the ratio 2/3, then the ratio of the current passing through the wires is m/n, where m and n are smallest integers. The value of m + n is_______.

Two circular coils of radii 20 cm and 30 cm having number of turns 50 and 100 made of same material are connected in series. The ratio of the magnetic field of induction at their centers is

The resultant magnetic moment of three magnetic dipoles, each of magnetic moment ‘M’ shown in the arrangement is

The binding energy per nucleon of deuteron ₁H² and helium nucleus  is 1.1 MeV and 7 MeV respectively.  If two deuteron nuclei react to form a single helium nucleus, then the energy released is

De Broglie wavelengths associated with a proton and an electron are in the ratio 2:1.

Their stopping potentials are approximately in the ratio of

An object P is kept in front of two plane mirror as shown in the figure. The number of images formed is k. The value of k is______________.

An astronomical telescope has an eye piece of focal length 5cm. If the angular magnification of normal adjustment is 10, the distance between the object and the eye piece is _______cm.

In a magnetic field of 0.05 T, area of a coil changes from 101cm² to 100cm² without changing the resistance which is 2Ω. The amount of charge that flows during this period is