Explain how magnets should be stored.

Explain how the bridges should be placed in order to divide a wire 1.1m. Long into three segments whose fundamental frqeuencies are in the ratio 1:2:3.

Explain how the bridges should be placed in order to divide a wire 1.10 m long into three segments whose fundamental frequencies are in the ratio 2:3:4.

Plaster of Paris should be stored in a moisture-proof container. Explain why?

Explain how the human ear works.

How are the two bar magnets shown alongside stored?

A coil of self-inductance L is placed in an external magnetic field (no current flows in the coil). The total magnetic flux linked with the coil is phi . The magnetic field energy stored in the coil is

Explain the precautions that should be taken while measuring length using a ruler

Explain why? conc. sulphuric acid should be stoppered.

Explain how an aeroplane gets 'lift'.

Explain how rain-coats become water-proof.