In olden days, sailors used to fine direction by suspending a piece of ____.

State the rule which is used to find the direction of field acting at a point near a current carrying street conductors?

State the rule which is used to find the direction of torque.

A_____is an instrument which is used to find directions.

The direction of torque is found using

______are used to lift heavy iron pieces.

True or False.If False give the correct statement: A compass can be used to find East-West direction at any place.

Four men and 4 women can finish a piece of work jointly in 3 days while 2 men and 5 women can finish the same work jointly in 4 days. Find the time taken by one man alone and that of one woman alone to finish the same work by using matrix inversion method.