The Circular Motion
A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV, the energy acquired by the alpha particle will be
- 4 MeV
- 0.5 MeV
- 1.5 MeV
- 1 MeV
When a proton is released from rest in a room, it starts with an initial acceleration a0 towards west. When it is projected towards north with a speed v0, it moves with an initial acceleration 3a0 towards west. Find the electric field and the minimum possible magnetic field in the room.
A flat plate is moving normal to its plane through a gas under the action of a constant force F. The gas is kept at a very low pressure. The speed of the plate v is much less than the average speed u of the gas molecules. Which of the following options is/are true?
The resistive force experienced by the plate is proportional to v
At a later time the external force F balances the resistive force
The plate will continue to move with constant non-zero acceleration, at all times
The pressure difference between the leading and trailing faces of the plate is proportional to uv
- 6.6 mV
- 3.3 mV
- 1 mV
- 13.2 mV
- 27 J
- 100 J
- None of these
- A circle of radius = 0.2 m and time period π×10−7s
- A circle of radius = 0.1 m and time period 2π×10−7s
- A helix of radius = 0.1 m and time period 2π×10−7s
- A helix of radius = 0.2 m and time period 4π×10−7s
What is Stark Effect?
A charged particle moves through a magnetic field in a direction perpendicular to it , then which of the following quantities remains unchanged?
Difference between conservative force and non conservative force ?
- 4 V
- 0.4 V
- 0.04 V
- 0.8 V
- a circle
- a straight line
- a helix with a non-uniform pitch.
- a helix with a uniform pitch
- The charge of M is greater than that of N
- The momentum of M is greater than that of N
- The charge to mass ratio of M is greater than that of N
- The speed of M is greater than that of N.
- 30 N/C, downwards
- 66.7 N/C, upwards
- 132 N/C, upwards
- 66.7 N/C, downwards
A beam of protons with speed enters a uniform magnetic field of at an angle of to the magnetic field. The pitch of the resulting helical path of protons is close to: (Mass of the proton =, charge of the proton =)
What would happen to the magnetic field lines if the current flowing through the conductor is reversed.
- Radius remains same.
- Magnetic force becomes half.
- Angular speed remains same.
- Time period becomes half.
- π−2 tan−1(mvqBR)
- π+2 tan−1(mvqBR)
The unit of electric current “ampere” is the amount of current that is flowing through each of two parallel long wires 1 m apart will give rise to a force per unit length between them equal to
2 × 10-7 N/m
1 × 10-2 N/m
4π × 10-7 N/m
- 1.5×10−9 C
- 2.5×10−9 C
- 3.5×10−9 C
- 4.5×10−9 C
- 10 T
- 0.1 T
- 1 T
- 0.01 T
A proton is moving along Z-axis in a magnetic field. The magnetic field is along X-axis. The proton will experience a force along
A particle of mass m and charge q is projected into a region having a perpendicular magnetic field B. Find the angle of deviation (figure 34.E14) of the particle as it comes out of the magnetic field if the width d of the region is very slightly smaller than
(a)mvqB (b)mv2qB (c)2mvqB
The masses of the nuclei are as follows,
m(1H2)=2.014 amu ; m(1H3)=3.016 amum(p)=1.007 amu ; m(n)=1.008 amu m(2He4)=4.001 amu
If the average power radiated by the star is 1016 W, the deuteron supply of the star is exhausted in a time period of the order of
[Take 1 amu=931.5 MeVc2 ]
- 106 s
- 108 s
- 1012 s
- 1016 s
Magnetic field strength due to a short bar magnet on its axial line at a distance x is B. What is its value at the same distance on the equatorial line?