If the angular speed of the armature of a dynamo is doubled then the amplitude of the induced e.m.f will become ___.

Horizontal and vertical components of earth’s magnetic field at a place are equal. The angle of dip at that place is ___ .

OR

A free floating magnetic needle at North Pole is____ to the surface of earth.

The magnetic flux linked with a coil changes by 2×10^-2Wb when the current changes by 0.01A. The self inductance of the coil is_ .

An electron is accelerated through a potential difference of 100 V, then de-Broglie wavelength associated with it is approximately A^o

^{An equilateral prism is made up of material of refractive index.} The angle of minimum deviation of light passing through the prism is ____ .