Calculate the mass of ice required to lower the temperature of 600 g of water at 50°C to water at 12°C. (Take, specific latent heat of ice = 366 Jg^-1 and specific heat capacity of water = 4.2 Jg^-1°C^-1)

Draw ray diagrams showing the image formation by a convex lens when an object is placed

(a) between optical centre and focus of the lens.

(b) between focus and twice the focal length of the lens.

Derive an expression for equivalent resistance in the following case

Decide, which resistances are in series and parallel. Solve for series and then for parallel. Combine both the results to get the equivalent resistance.

A wire is dropped freely towards earth. Will any emf be induced across the ends of wire, if wire is initially in

(a) north-south direction?

(b) east-west direction?