Three moving coil galvanometer A,B and C are made of coils of three different material having torsional constrant `1.8xx10^(-8), 2.8xx10^(-8)` and `3.8xx10^(-8)` respectively if the three galvanometer are identical in all other respect then in which of the above cases sensitivity maximum

Light travels in two media A and B with speeds 1.8xx10^(8)ms^(-1) and 2.4xx10^(8)ms^(-1) respectively. Then tha angle between them is

Equimoler solulition of HF, HCOOH and HCN at 298 K have the values of Ka as 6.8xx10^(-4), 1.8xx10^(-4) and 4.8xx10^(-9) respectively, what will be the order of their acidic strength ?

Two moving coil galvanometer, X and Y have coils with resistance 10 Omega and 14 Omega cross-sertional areas 4.8xx10^(-3)m^(2) and 2.4xx10^(-3)m^(2) , number of turns 30 and 45 respectively. They are placed in magnetic field of 0.25 T and 0.50 T respectively. Then, the ratio of their voltage sensitivities and the ratiof of their voltage senstivities are respectively

The coil of a moving coil galvanometer is suspended in a magnetic field of 100 G. If the torsional constant of the suspension wire is 1.5 xx 10^(-8) Nm/rad, find the current sensitivity of galvanometer. The area of the coil is 0.05 m^(2) .

Four charges 10^(-8), -2 xx 10^(8), +3xx10^(-8) and 2xx10^(-8) coulomb are placed at the four corners of a square of side 1m the potential at the centre of the square is