Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
holtadit:
--- Quote from: ang3l on April 29, 2010, 12:18:22 pm ---2002 Nov Paper 3 Question 8:
Fig. 8.1 shows a long straight wire between the poles of a permanent magnet.
It is connected through a switch to a battery so that, when the switch is closed, there is a
steady current in the wire.
(wire in a direction at right angles to the page)
How can we find the direction of the movement of wire..I know by using fleming's L.H.R but there is no direction for current given?Or maybe i didnt understood the question :S
--- End quote ---
Read the question it says that the current flows into the page. Use Fleming Left hand rulle and it should be easy now.
Malak:
Ohkay....Thx :)
omair:
how can we use the screw guage if there are many sheets of paper and can you explain the specific latent and specific heat capacity also how can we know which of the given objects have high heat capacity
astarmathsandphysics:
measure the thickness of 20 sheets of paper and divide by 20
The Golden Girl =D:
--- Quote from: omair on April 30, 2010, 01:23:57 pm ---how can we use the screw guage if there are many sheets of paper and can you explain the specific latent and specific heat capacity also how can we know which of the given objects have high heat capacity
--- End quote ---
the equation for heat capacity ...... Energy = mass * heat capacity* (temp 2 - temp1)
to find whether this material has more or less heat capacity is by using the formula as follows:
heat capacity = Energy / mass *(temp 1 - temp 2 ) ......
if it has more difference in the temperature it has low heat capacity , and vice versa.
..................................
as for the screw gauage , i never heard of it ?! so u'll have to tell me the paper that has this question so thati can help u .
...........................
specific latent heat of fusion = is the amount of heat energy given to a unit mass of a solid to change it to a liquid at a fixed temperature
specific latent heat of vaporization = is the amount of heat energy given to a unit mass of a liquid into vapor /gas at a fixed temperature
specific heat capacity = is the amount of heat energy given to a unit mass of a substance to increase temperature by 1 degree Celsius
hope i helped
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