The path executed by a charged particle whose motion is perpendicular to magnetic field i
|
(a) A straight line |
(b) An ellipse |
(c) A circle |
(d) A helix |
(c) A circle
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Assertion : Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.
Reason : A charged particle produces a magnetic field.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Mutual inductance of two coils can be increased by
|
(a) Decreasing the number of turns in the coils |
|
(b) Increasing the number of turns in the coils |
|
(c) Winding the coils on wooden core |
|
(d) None of the above |
Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 and 40 cm and they carry respectively 0.2 and 0.3 ampere current in opposite direction. The magnetic field in 
at the centre is
|
(a) |
(b) |
(c) |
(d) |
In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is
|
(a) 1.0 mm |
(b) 0.1 mm |
(c) 0.05 mm |
(d) 0.01 mm |
Activity of radioactive element decreased to one third of original activity 
in 9 years. After further 9 years, its activity will be
|
(a)
|
(b) 
|
(c) |
(d) |
