Magnetic flux is the __________ of an area and the component of the magnetic field strength perpendicular to that area.

If the current flow through an electrical appliance is greater than the maximum it can carry, the fuse in the appliance will _________.

When an electric current flows through in an electrical conductor, it produces thermal energy because _________.

Simple 'single loop' circuits are called _________circuits.

To make a perfect convex lens of large diameter free from defects, ________ is used as the objective of the telescope instead of a convex lens. .

Kirchhoff’s voltage rule is based on the conservation of ___________.

The magnifying power of the compound microscope is the product of the magnification of the objective lens and ________.

Before the capacitor is charged, its capacitance and potential difference will __________.

The unit of solid angle is _________.