A positively charged particle projected towards east is deflected towards north by a magnetic field. The field may be
1. towards west
2. towards south
3. upward
4. downward
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA charged particle is whirled in a horizontal circle on a frictionless table by attaching it to a string fixed at one point. If a magnetic field is switched on in the vertical direction, the tension in the string
1. will increase
2. will decrease
3. will remain the same
4. may increase or decrease.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following particles will experience maximum magnetic force (magnitude) when projected with the same velocity perpendicular to a magnetic field?
1. electron
2. proton
3. \(\text{He}^{+}\)
4. \(\text{Li}^{++}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following particles will describe the smallest circle when projected with the same velocity perpendicular to a magnetic field?
1. Electron
2. Proton
3. He+
4. Li+
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field?
1. electron
2. proton
3. He+
4. Li+
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA beam consisting of protons and electrons moving at the same speed goes through a thin region in which there is a magnetic field perpendicular to the beam. The protons and the electrons,
1. | will go undeviated. |
2. | will be deviated by the same angle and will not separate. |
3. | will be deviated by different angles and hence separate. |
4. | will be deviated by the same angle but will separate. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle will be
1. a straight line
2. a circle
3. a helix with uniform pitch
4. a helix with a nonuniform pitch
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA particle moves in a region having a uniform magnetic field and a parallel, uniform electric field. At some instant, the velocity of the particle is perpendicular to the field direction. The path of the particle will be
1. a straight line
2. a circle
3. a helix with uniform pitch
4. a helix with a nonuniform pitch
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn electric current \(i\) enters and leaves a uniform circular wire of radius \(a\) through diametrically opposite points. A charged particle \(q\) moving along the axis of the circular wire passes through its centre at speed \(v\). The magnetic force acting on the particle when it passes through the centre has a magnitude:
1. \(qv\dfrac{\mu_{0} {i}}{2 {a}}m\)
2. \(qv\dfrac{\mu_{0} {i}}{2 {\pi a}}\)
3. \(qv\dfrac{\mu_{0}{i}}{ {a}}\)
4. zero
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf a charged particle at rest experiences no electromagnetic force then,
(a) | the electric field must be zero. |
(b) | the magnetic field must be zero. |
(c) | the electric field may or may not be zero. |
(d) | the magnetic field may or may not be zero. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology