Electric field intensity ‘E’ at a point P (Figure 1) at a perpendicular distance ‘r’ from an infinitely long line charge X’X having linear charge density X is given by:

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B.

A moving coil galvanometer can be converted into a voltmeter by connecting:

• A low resistance in series with its coil.
• A low resistance in parallel with its coil.
• A high resistance in parallel with its coil.
• A high resistance in series with its coil.

The loss of power in a transformer can be reduced by:

• Increasing the number of turns in primary
• Increasing ac voltage applied to primary.
• Using a solid core made of steel.
• Using a laminated core of soft iron.

Which equation represents the emission of a beta particle by a radioactive nucleus:

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A.

An important component of Michelson’s method to determine speed of light is:

• A NICOL prism   
• A bi prism
• A grating 
• An ocatgonal mirror.