| 1. | Two a-particles have the ratio of their velocities as 3 : 2 on entering the field. If they move in different circular paths, then the ratio of the radii of their paths is ? | |
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4 : 9
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9 : 4
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3 : 2
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2 : 3
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Report Question| 2. | Which of the following is not correct about cyclotron ? | |
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The operation of the cyclotron is based on the fact that the time for one revolution of an ion is independent of its speed or radius of its orbit.
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The charged particles and ions in cyclotron can move on any arbitrary path.
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Cyclotron uses both electric and magnetic fields in combination to increase the energy of charged particles.
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It is a machine to accelerate charged particles or ions to high energies.
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| 3. | The gyro-magnetic ratio of an electron in an H-atom, according to Bohr model, is ? | |
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neutral
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positive
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increases with the quantum number n.
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independent of which orbit it is in.
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| 4. | A current carrying closed loop of an irregular shape lying in more than one plane when placed in uniform magnetic field, the force acting on it ? | |
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may or may not be zero.
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is infinite.
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will be more in the plane where its larger position is covered.
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is zero.
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| 5. | In a cyclotron, a charged particle ? | |
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slows down within a dee and speeds up between deeps.
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speeds up in a deep.
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undergoes acceleration all the time.
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speeds up between the deeps because of the magnetic field.
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| 6. | If the beams of electrons and protons move parallel to each other in the same direction, then they ? | |
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repel each other.
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attract each other.
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neither attract nor repel.
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no relation.
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| 7. | Ampere’s circuital law is equivalent to ? | |
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Kirchhoff’s law
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Faraday’s law
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Biot-Savart law
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Coulomb’s law
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| 8. | A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is ? | |
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NABI^2
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NA^2B^2 I
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N^2ABI
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NABI
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| 9. | A wire is placed parallel to the lines of force in a magnetic field and a current flows in the wire. Then ? | |
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it experiences a force in a direction perpendicular to lines of force
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the wire will experience a force in a direction opposite to the field
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the wire will not experience any force at all
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the wire will experience a force in the direction of the magnetic field
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| 10. | A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v. The radius of the circular path described by it will be ? | |
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mq / Bv
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mB / qv
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mv / Bq
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Bq / mv
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