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# NEET Physics  Magnetism in Electric Current  Practice Q & A

1. A cyclotron is used to accelerate

 only negatively charges particles neutron both positively and negatively charged particles only positively charged particles

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2. 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

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3. 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

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4. 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

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5. 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

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6. 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

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7. 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

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8. 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

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9. 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 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.

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10. 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

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