An electron with kinetic energy 2.5 keV moving along the positive direction of an x axis enters a region in which a uniform electric field of magnitude 10 kV`//`m is in the negative direction of the y-axis. A uniform magnetic field `vecB` is to be set up to keep the electron moving along the x-axis , and the direction `vecB` of is to be chosen to minimize the required magnitude of `vecB`. In unit-vector notation, what `vecB` should be set up?
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A uniform electric field is along x-axis. The potential difference `V_(A)-V_(B)=10 V` is between two points A (2m, 3m) and (4m, 8m). Find the electric
`E=(Delta V)/(Delta d)=10/2=5 V//m`. (It is along + ve x-axis)
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A uniform electric field,`underset(E)to=E_(0)hati` and a uniform magnetic field,`underset(B)to=B_(0)hati` exist in region `y gt 0. A` particle hav- in
Correct Answer - `(i) E_(0)/B_(0)=(2v_(0))/(pi)" "(ii)(0,0,(2mv_(0))/(qB_(0)))` (iii) v_(min = v_(0)`
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A particle of mass m and charge q is moving in a region where uniform electric field `underset(E)to` and and uniform mag-netic field `underset(B)to`ar
Correct Answer - `vec(V)cos((qBt)/(m))vec(V)_(0)+((qt)/(m))(vec(E))+sin((qBt)/(m))((vecV_(0)xxvec(B))/(B))`
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In a region of space a uniform magnetic field exist in positive z direction and there also exists a uniform electric field along positive y direction.
Correct Answer - `R=(mE_(0))/(qB_(0)^(2))`
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A long wire is along `x = 0, z = d` and carries current in positive y direction. Another wire is along `x = y, z = 0` and carries current in direction
Correct Answer - `(mu_(0)I)/(2pid) sqrt(5/4)+(1/sqrt(2))`
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An electron moving with a velocity `10^(8) m//s` enters a magnetic field at an angle of `20^(@)` to the direction of the field. Calculate (a) The valu
Correct Answer - [(a) `9.6 xx 10^(-5) T`; (b) `3.69 xx 10^(-7)s`; (c) 34.68m]
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An electron is accelerated through a `PD` of `100 V` and then enters a region where it is moving perpendicular to a magnetic field `B=0.2T`. Find the
Correct Answer - [0.0167 cm, 0.7 cm]
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Iron emits `K_alpha` X-ray of energy 6.4 keV and Calcium emits `K_alpha` X-ray of energy 3.69 keV. Calculate the times taken by an iron `K_a` photon a
Correct Answer - [10 us by both]
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The energy of K-electron in tungsten is -20.0 keV and of an L-electron is -2.0 ke V. Find the wavelength of X-rays emitted when an electron jumps from
Correct Answer - 0.6875 Å
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A moving particle of charge q and mass m enters a uniform magnetic field perpendicular to the direction of field. Then
A moving charge particle enters a uniform magnetic field perpendicular to the direction of field. Then it follow a circular path. The magnetic field perpendicular to velocity. So, the particle will perform...
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