Search This Blog
हम आपके सपनो को साकार करेंगे III
Posts
A students performs an experiment to determine the young’s modulus of a wire , exactly 2m long buy Searle’s method . In a particular reading ,the student measures the extension in the length of the wire to be 0.8 mm with an uncertainty of ±0.05 mm at a load of exactly 1.0 kg the student also measures the diameter of the wire to be 0.4mm with an uncertainty of ± 0.01mm. Take g = 10.0 m𝑠^(−2) . The young’s modulus obtained from the reading is A) (2.0 ±0.3) x 〖10〗^11 N𝑚^(−2) B) (2.0 ±0.2) x 〖10〗^11 N𝑚^(−2) C) (2.0 ±0.1) x 〖10〗^11 N𝑚^(−2) D) (2.0 ±0.05) x 〖10〗^11 N𝑚^(−2)
- Get link
- X
- Other Apps
In young’s double slit experiment , the distance between the slits varies with time as d(t) = 2𝑑_𝑜 + 𝑑_𝑜sin𝜔𝑡 where 𝑑_𝑜 and 𝜔 are positive constants . The difference between the largest and the smallest fringe width obtained over time is ( D = distance between slits and screen ≫d & λ=𝑤𝑎𝑣𝑒𝑙𝑒𝑛𝑡ℎ 𝑜𝑓 𝑙𝑖𝑔ℎ𝑡 𝑢𝑠𝑒𝑑 ) A ) 𝐷λ/(2𝑑_𝑜 ) B) 𝐷λ/(3𝑑_𝑜 ) c) 2𝐷λ/(3𝑑_𝑜 ) D) 𝐷λ/(6𝑑_𝑜 )
- Get link
- X
- Other Apps
A pane electromagnetic wave travelling along the positive x-direction has a wavelength of 3mm . The variation in the electric field occurs in the y – direction with an amplitude 66 V/m . The equations for the electric and magnetic fields as a function of x and t are respectively . 𝐸_𝑦 = 66 cos 𝜋 x 〖10〗^11(t - 𝑥/𝑐 ) , 𝐵_𝑧 = 1.1x 〖10〗^(−7) cos 𝜋 x 〖10〗^11(t - 𝑥/𝑐 ) 𝐸_𝑦 =11 cos 2𝜋 x 〖10〗^11(t - 𝑥/𝑐 ) , 𝐵_𝑦 = 11x 〖10〗^(−7) cos 2𝜋 x 〖10〗^11(t - 𝑥/𝑐 ) 𝐸_𝑥 = 66 cos 𝜋 x 〖10〗^11(t - 𝑥/𝑐 ) , 𝐵_𝑥 = 2.2 x 〖10〗^(−7) cos 𝜋 x 〖10〗^11(t - 𝑥/𝑐 ) 𝐸_𝑦 = 66 cos 2𝜋 x 〖10〗^11(t - 𝑥/𝑐 ) , 𝐵_𝑧 = 2.2 x 〖10〗^(−7) cos 2𝜋 x 〖10〗^11(t - 𝑥/𝑐 )
- Get link
- X
- Other Apps
The χ - 1/𝑇 graph for an alloy of paramagnetic nature is shown in fig . The curie constant is nearly 57k 2.8 X 〖10〗^(−3) k 570k 17.5 x 〖10〗^(−3) k
- Get link
- X
- Other Apps
Assertion : A current I flows along the length of an infinitely long straight and thin walled pipe . Then the magnetic field at any point inside the pipe is zero Reason : ∮1▒〖(𝐵.) ⃗(𝑑𝑙.) ⃗ 〗 = 〖𝜇" " 〗_𝑜 I Read the assertion and reason carefully to mark the correct option out of the options given below : Both assertion and reason are true and the reason is the correct explanation of the assertion Both assertion and reason are true but reason is not the correct explanation of the assertion Assertion is true but reason is false Assertion and reason both are false
- Get link
- X
- Other Apps
Three large plates are arranged as shown . How much charge will flow through the key when it is closed ? A) 5𝑄/6 B) 4𝑄/3 C) 3𝑄/2 D)Q
- Get link
- X
- Other Apps
A particle free to move along the x-axis has potential energy given by U(x) = K(1-〖 𝑒〗^(−𝑥^2 )) for −∞ ≤x≤ +∞ where k is a positive constant of appropriate dimensions . Then At point away from the origin ,the particle is in unstable equilibrium For any finite non zero value of x , there is a force directed away from the origin If its total mechanical energy is k/2 , then kinetic energy at the origin is k For small displacements from x=0 the motion is simple harmonic
- Get link
- X
- Other Apps
Two rigid boxes containing different ideal gases are placed on a table . Box A contains one mole of nitrogen at temperature 𝑇_𝑜 , while box B contains one mole of helium at temperature 7/3 𝑇_𝑜 . The boxes are then put into thermal contact with each other and heat flows between them until the gases reach a common final temperature (ignore the heat capacity of boxes and heat exchange will happen only between boxes ) . Then the final temperature of the gases in terms of 𝑇_𝑜 is 7/3 𝑇_𝑜 3/2 𝑇_𝑜 5/2 𝑇_𝑜 3/7 𝑇_𝑜
- Get link
- X
- Other Apps