- The electric field inside a uniformly charged spherical shell is 0 (Coulomb’s Law), hence \( {(A)-(III)} \).
- The electric field due to a uniformly charged infinite plane sheet is \( \frac{\sigma}{2\epsilon_0} \), hence \( {(B)-(II)} \).
- The electric field outside a uniformly charged spherical shell behaves like that of a point charge and is \( \frac{\sigma}{\epsilon_0 r^2} \), hence \( {(C)-(IV)} \).
- The electric field between two oppositely charged infinite plane sheets is \( \frac{\sigma}{\epsilon_0} \), hence \( {(D)-(I)} \). Thus, the correct answer is \( {(1)} \).
A black body is at a temperature of 2880 K. The energy of radiation emitted by this body with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between 1499 nm and 1500 nm is U3. The Wien's constant, b = 2.88×106 nm-K. Then,

The center of mass of a thin rectangular plate (fig - x) with sides of length \( a \) and \( b \), whose mass per unit area (\( \sigma \)) varies as \( \sigma = \sigma_0 \frac{x}{ab} \) (where \( \sigma_0 \) is a constant), would be 
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)