MCQ
Electric lines of force:
- AExist everywhere.
- BExist only in the immediate vicinity of electric charges.
- CExist only when both positive and negative charges are near one another.
- DAre imaginary.
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What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm
|
(a) 0.001 rad |
(b) 0.01 rad |
(c) 1 rad |
(d) 0.1 rad |
The potential gradient along the length of a uniform wire is 10 volt/metre. B and C are the two points at 30 cm and 60 cm point on a meter scale fitted along the wire. The potential difference between B and C will be
|
(a) 3 volt |
(b) 0.4 volt |
(c) 7 volt |
(d) 4 volt |
A spectrum is formed by a prism of dispersive power ‘ω’. If the angle of deviation is ‘δ’, then the angular dispersion is
|
(a) ω/δ |
(b) δ / ω |
(c) 1/ ωδ |
(d) ω δ |
A coil of N turns and mean cross-sectional area A is rotating with uniform angular velocity w about an axis at right angle to uniform magnetic field B. The induced e.m.f. E in the coil will be
|
(a) NBA sinwt |
(b) NB w sinwt |
(c) NB/A sinwt |
(d) NBA w sinwt |