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Physics: Post your doubts here!

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But the arrows are continuous in circle, how can we only assume downwards, if it is then I am thinking of the left hand rule rather than right hand rule


no the question say 'Magnetic Field At Q Due To current in XY' ...focus on the part 'AT Q' :)
 
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But the arrows are continuous in circle, how can we only assume downwards, if it is then I am thinking of the left hand rule rather than right hand rule

you use flemings left hand rule for force once you know the DIRECTION OF FIELD AND CURRENT...or any two of the the three...here you know only the direction of current !
 
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you use flemings left hand rule for force once you know the DIRECTION OF FIELD AND CURRENT...or any two of the the three...here you know only the direction of current !

So this is instantaneous, it changes every position, just like circular motion?
 
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Haha ok then my bad, so basically you stop at Q and see the arrow for the anticlockwise

YES :) we stop at Q..at every new point around wire XY the direction of Magnetic feild is different...but you would rather not say instantaneous..as the direction magnetic field for a point around wire XY say same throughout until the current in wire XY is switched OFF !
 
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YES :) we stop at Q..at every new point around wire XY the direction of Magnetic feild is different...but you would rather not say instantaneous..as the direction magnetic field for a point around wire XY say same throughout until the current in wire XY is switched OFF !

Thanks, you're definitely getting A* (y)
 
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Hi is there anyway I can get sample results so I can practice drawing graphs for paper 3 for AS Physics.
 
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A2 Physics, Oct/Nov 2009 Variant 41 Q 10.
I don't get which resistors we use for the calculation of the pd across the inverting and non inverting inputs.
 
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I got the first part of the question correct but then in the second one, I tried to Force by the 1.4nC = Force by the 1.6 nC but then I don't know whether it is in equilibrium then I tried using ratio and proportionality like doubling the force I got from the previous question. I really don't get the question. How can we picture it first of all? Please help.

IMG_20130423_190305.jpg
 
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SOME HELP HERE! FOR A2 PHYSICS!!(Paper 4)

I m confused whether my answers r ryt n also cudnt answer the last 2! Help please... Would be very grateful! :)


Q.In each of the following cases, state what provides the centripetal force:
  1. Moon orbiting the Earth
  2. A car round a bend on a flat,rough road
  3. The weight on the end of a swinging pendulum.
  4. A planet orbiting the Sun
  5. A child on a playground roundabout
  6. A train on a curved track
  7. A passenger going in a car going round a corner.

Ans. a.The gravitational pull of earth on moon
b. The frictional force of the wheel on the road.
c. Tension on the spring supporting the pendulum
d. the pull of the sun on the planet
e. Tension on the string of the roundabout
f.
g.
 
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Can someone please reason out the answers in this question paper!!!!!!!!!!!!!
 

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Stuck badly please help!! May u be blessed for helping! Dnt knw ans to it! :(


1. Describe the changes to the kinetic energy, the potential energy and the total internal energy of a block of ice as:
i. it melts at 0oC
ii. the temperature of water rises from 0oC to room temperature.
 
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