1.If the p. d. between two plates separated by a distance d be V, then electric field E is equal to

2.A charged particle moves through a magnetic field in a direction perpendicular to it, then

3.A length of wire carries a steady current. It is bent to form a circular coil of one turn only. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is

4.The magnetic induction at a point due to a long straight conductor carrying current is independent of

5.A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a it at the same distance. The magnetic field at P is