- ARemains unaffected.
- BDecreases.
- CFirst increases then decreases.
- DIncreases.
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Two short magnets having magnetic moments in the ratio 27 : 8, when placed on opposite sides of a deflection magnetometer, produce no deflection. If the distance of the weaker magnet is 0.12 m from the centre of deflection magnetometer, the distance of the stronger magnet from the centre is
|
(a) 0.06 m |
(b) 0.08 m |
(c) 0.12 m |
(d) 0.18 m |
The unit of intensity of electric field is
|
(a) Newton/Coulomb |
(b) Joule/Coulomb |
(c) Volt - metre |
(d) Newton/metre |
A hydrogen atom (ionisation potential 13.6 eV) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is
|
(a) 1.89 eV |
(b) 2.55 eV |
(c) 12.09 eV |
(d) 12.75 eV |
A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of 45°. If the current be reduced by a factor of
, the deflection would
| (a) Decrease by 30° | (b) Decrease by 15° | (c) Increase by 15° | (d) Increase by 30° |