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Which of the following transition will have highest emission wavelength
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(a) n = 2 to n = 1 |
(b) n = 1 to n = 2 |
(c) n = 2 to n= 5 |
(d) n = 5 to n = 2 |
An electric potential difference will be induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction
|
(a) P |
(b) Q |
(c) L |
(d) M |
A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as
|
(a) |
(b) |
(c) |
(d) |
A helium nucleus makes a full rotation in a circle of radius 0.8 metre in two seconds. The value of the magnetic field B at the centre of the circle will be
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(a) |
(b) |
(c) 2 |
(d) |
A proton (mass m and charge +e) and an α - particle (mass 4m and charge +2e) are projected with the same kinetic energy at right angles to the uniform magnetic field. Which one of the following statements will be true
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(a) The α - particle will be bent in a circular path with a small radius that for the proton |
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(b) The radius of the path of the α - particle will be greater than that of the proton |
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(c) The α - particle and the proton will be bent in a circular path with the same radius |
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(d) The α - particle and the proton will go through the field in a straight line |
The field due to a long straight wire carrying a current I is proportional to
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(a) I |
(b) |
(c) |
(d) 1/I |
