Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways P,Q and R as shown in fig with current connection shown, the magnetic field at the centre of the square is zero in cases

In P only
In P and Q only
In Q and R only
P and R only
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5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C. If Na2SO4 is 81.5% ionised, the value of x (K

A capacitor is made of two square plates each of side 'a' making a very small angle
A solution of m-chloroaniline, m-chlorophenol and m-chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of NaHCO3 to give fraction A. The leftover organic phase was extracted with d