23498.A cyclotron is used to accelerate
only negatively charges particles
neutron
both positively and negatively charged particles
only positively charged particles
23499.In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a
circle
helix
straight line
ellipse
23500.A charged particle experiences magnetic force in the presence of magnetic field. Which of the following statement is correct?
The particle is moving and magnetic field is perpendicular to the velocity
The particle is moving and magnetic field is parallel to velocity
The particle is stationary and magnetic field is perpendicular
The particle is stationary and magnetic field is parallel
23501.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
1 MeV
4 MeV
0.5 MeV
1.5 MeV
23502.A galvanometer of resistance 50 Ω gives a full scale deflection for a current 5 × 10–4 A. The resistance that should be connected in series with the galvanometer to read 3 V is
5059 Ω
595 Ω
5950 Ω
5050 Ω
23503.An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57 × 10–2 T. If the value of e/m is 1.76 × 1011 C/kg, the frequency of revolution of the electron is
1 GHz
100 MHz
62.8 MHz
6.28 MHz
23504.A proton is projected with a uniform velocity ‘v’ along the axis of a current carrying solenoid, then
the proton will be accelerated along the axis
the proton path will be circular about the axis
the proton move along helical path
the proton will continue to move with velocity ‘v’ along the axis
23505.If a velocity has both perpendicular and parallel components while moving through a magnetic field, what is the path followed by a charged particle?
Circular
Elliptical
Linear
Helical
23506.This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement – I : Higher the range, greater is the resistance of ammeter.
Statement – II : To increase the range of ammeter, additional shunt needs to be used across it.
Statement – I : Higher the range, greater is the resistance of ammeter.
Statement – II : To increase the range of ammeter, additional shunt needs to be used across it.
Statement – I is true, Statement – II is true, Statement – II is the correct explanation of Statement–I.
Statement – I is true, Statement – II is true, Statement – II is not the correct explanation of Statement–I.
Statement – I is true, Statement – II is false.
Statement – I is false, Statement – II is true.
23507.A proton beam enters a magnetic field of 10–4 Wb m–2 normally. If the specific charge of the proton is 1011 C kg–1 and its velocity is 10° ms–1, then the radius of the circle described will be
100 m
0.1 m
1 m
10 m
23508.A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 Weber/m2. The coil carries a current of 2 A. If the plane of the coil is inclined at an angle of 30° with the direction of the field, the torque required to keep the coil in stable equilibrium will be
0.12 Nm
0.15 Nm
0.20 Nm
0.24 Nm
23509.A galvanometer of resistance 30 Ω is connected to a battery of emf 2V with 1970 Ω resistance in series. A full scale deflection of 20 divisions is obtained in the galvanometer. To reduce the deflection to 10 divisions, the resistance in series required is
4030 Ω
4000 Ω
3970 Ω
2000 Ω
23510.A current I flows along the length of an infinitely long, straight, thin walled pipe. Then
the magnetic field is zero only on the axis of the pipe
the magnetic field is different at different points inside the pipe
the magnetic field at any point inside the pipe is zero
the magnetic field at all points inside the pipe is the same, but not zero
23511.A galvanometer having a coil resistance of 100 Ω gives a full scale deflection, when a current of 1 mA is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of 10 A, is
2 Ω
0.1 Ω
3 Ω
0.01 Ω
23512.A charged particle moves through a magnetic field perpendicular to its direction. Then
the momentum changes but the kinetic energy is constant
both momentum and kinetic energy of the particle are not constant
both momentum and kinetic energy of the particle are constant
kinetic energy changes but the momentum is constant