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CBSE Notes 2011-2012 » XII-Physics

Current Electricity

You are asked to measure emf of a cell. Which instrument will you use

Short answer question

You are asked to measure emf of a cell. Which
instrument will you use

How does the drift velocity of electrons in a metallic conductor vary with increase in temperature ?...

Short answer question

How does the drift velocity of electrons in a
metallic conductor vary with increase in
temperature ? [Delhi 2002]

If a wire of resistivity 'p' is stretched to thrice its initial length, what will be its new resisti...

Short answer question

If a wire of resistivity 'p' is stretched to thrice
its initial length, what will be its new
resistivity ?

Nichrome and copper wires of the same length and same radius are connected in series. Current I is p...

Short answer question

Nichrome and copper wires of the same length
and same radius are connected in series. Current
I is passed through them. Why does the
nichrome wire get heated first ? [AI 2001C]

A heater joined in parallel with a 60 W bulb is connected to the mains. If the 60 W bulb is replaced...

Short answer question

A heater joined in parallel with a 60 W bulb is
connected to the mains. If the 60 W bulb is
replaced by a 100 W bulb, will the rate of heat
produced by the heater be more, less or remain
the same?

As P I:R. it becomes four times.

Short answer question

As P I:R. it becomes four times.

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