When we place a voltage of 4v across an unknown substance, 0.1a of current is seen to flow. if the material is ohmic, how much voltage will be needed to dissipate a power of 10 w? (write your answer in units of volts).

Voltage will be 100 volt

Explanation:

We have given current through the circuit i = 0.1 A

Power dissipated P = 10 W

We know that power dissipated through any resistive cirvuit is given by

, here i is current and R is resistance

So

R =1000 ohm

Now according to ohm's law V = iR

So Voltage V = 0.1×1000 = 100 volt  

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it