Homework Statement
We have to measure emf of a battery. We have to voltmeters. Each of them when connected alone across the battery, they read V1 = 0.9V and V2 = 0.6V and when both of them are connected to the battery simultaneously, they both read V3 = 0.45V . What is the emf of battery...
Why don't wires in any circuit touch each other and get short circuited?
If two current carrying wires carry charges in same direction then from ampere's law,can't they touch each other due to attractive forces?
The tension will be - (mg/L)*x where x is the distance from the bottom
Elongation...it should be the force causing the elongation ...in this case the weight so it is (W/AY)dx where dx is the length of the segment
Yep.It's the weight of the bar...I kinda mixed the wire from the first case
In the second case,some stress will be acting because the width gets elongated...I have heard that young's modulus makes sense when stress and strain are proportional.
In the second case,the wire is acting along the...
In the second case,the wire gets elongated but the restoring force that is tension remains constant but it;'s width get elongated so will stress also act in that case?
Makes sense then.So the uppermost point is most probable to break first
So the strain will not tell us the condition for breaking but the stress will,right?
If the breaking stress is equal to the external force (weight) at the topmost point then beyond this the wire breaks,right?
What does...
Since at the top,the maximum tension acting on is the weight of the wire mg (Why are we calculating this for the upprmost point tho)
If at breaking stress,it has to elongate before it breaks then can we use the formulae of strain here maybe
Since the stress is magnitude of the internal restoring force per unit which in this case is the tension then it will be greatest at the top
How exactly did you know to apply the formulae for strain in the second case...I struggled a lot for that
My definitions prior to solving a question...
Homework Statement
1) calculate the longest
length of steel wire that can hang vertically without breaking
.breaking stress for steel=7.982*10^8N/m^2 and density of
steel(d)=8.1*10^3kg/m^3.
2)A bar of mass m and length l is hanging from a point A as shown in the figure.Find the...
So I can think of unpolarised light as conissting of many polarised lights perpendicular to the direction of wave direction...?
Can we do components of these polarised waves in any two perpendiular direction?
Homework Statement
How does this picture represent a unpolarised light?
Homework Equations
The Attempt at a Solution
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I thought light waves were perpendicular to the direction of propogation so if it has diagonal components then isn't that not perpendicular to the wave direction...
Homework Statement
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In this question, it asks for the magnetic field associated with the electromagnetic wave.
Homework Equations
The Attempt at a Solution
The magnetic field is perpendicular to Electric field but it can be in either x or z direction...how do I choose the direction.I
Okay.
The current in the moving coil ammeter is given by
S=Ig G/I-Ig
Using this ,I calculated the current through the galvanometer which came out to be 11 ig when I plugged S=G/10
All the major current will flow through the shunt while the same current ig will flow through the galvanometer but my textbook says it will show a deflection of I in this case so I was just confused here.
I see now that the sensitivity will get changed due to change in current
So here since...
Homework Statement
An EM wave from air enters a medium.
The electric fields are
--> ^
E1 = E01 cos(2πv(z/c-t) x
--> ^
E2 =E02cos(k(2z-ct)x in a medium ,where the wave number k and frequency v refer to their value in air.the medium...
The current through the galvanometer increases and it's value is 11ig(full scale current) tho idk why it gets increases ...?
The deflection will be more in the second case
Homework Statement
If a shunt of 1/10th of the coil resistance is applied to a moving coil galvanometer,then it's sensitivity becomes
(a)10 fold
(b)11 fold
(c)1/10 fold
(d)1/11 fold
Homework Equations
ϕ / I = NAB/L
The Attempt at a Solution
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So sensitivity gets increased by only...
Homework Statement
Two cells of same emf E and different internal resistance r1 and r2 are connected in series to an external resistance R.The value of R for which the potential difference across the first cell is zero is given by
(A) R=r1/r2
(B)R=r1+r2
(C)R=r1-r2
(D)R=r1r2
Homework Equations...
I made a mess there...only odd values of n will be alllowed there so I should have used a different variable for that
I n any case the value of n will be 3
Initially the tube won't be in resonance. (What does this mean)
Homework Statement
In a resonance tube experiment, a closed organ pipe of length 120 cm resonates ,when tuned with a tuning fork of length 120cm resonates,when tuned with a tuning fork of length 340 hz.If water is poured into the pipe ,then (speed of sound in air=340 ms^-1)
(A) minimum length...