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An electron (charge q coulomb) enters a magnetic field of H 
with a velocity of vm/s in the same direction as that of the field the force on the electron is
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(a) Hqv Newton’s in the direction of the magnetic field |
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(b) Hqv dynes in the direction of the magnetic field |
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(c) Hqv Newton’s at right angles to the direction of the magnetic field |
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(d) Zero |
$\sqrt{\frac{\text{GM}}{4\text{R}}}$
$\sqrt{\frac{\text{RM}}{2\text{R}}}$
$\sqrt{\frac{\text{GM}}{\text{R}}}$
$\sqrt{\frac{2\text{GM}}{\text{R}}}$
The ratio of minimum to maximum wavelength in Balmer series is
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(a) 5 : 9 |
(b) 5 : 36 |
(c) 1 : 4 |
(d) 3 : 4 |
In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be
| (a) 4 : 1 | (b) 1 : 2 | (c) 2 : 1 | (d) 1 : 8 |
Two cells when connected in series are balanced on 8m on a potentiometer. If the cells are connected with polarities of one of the cell is reversed, they balance on 2m. The ratio of e.m.f.'s of the two cells is
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(a) 3 : 5 |
(b) 5 : 3 |
(c) 3 : 4 |
(d) 4 : 3 |