The speed of electromagnetic waves in vaccum is equal to
Options
(a) μ₀ε₀ (b) √(μ₀ε₀) (c) 1/√(μ₀ε₀) (d) 1/(μ₀ε₀)
Correct Answer:
1/√(μ₀ε₀)
Explanation:
According to Maxwelll, it is found that the electromagnetic waves […]
Two thin long conductors seprated by a distance d carry currents I₁ and I₂ in the same direction. They exert a force F on each other. Now, the current in one of them is increased […]
The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 μT. What will be […]
To get three images of single object, one should have two plane mirrors at an angle of
Options
(a) 60⁰ (b) 90⁰ (c) 120⁰ (d) 30⁰
Correct Answer:
90⁰
Explanation:
Consider the diagram where […]
In a given reaction, ᴢXᴬ → ᴢ+1Yᴬ → ᴢ-1Kᴬ⁻⁴ → ᴢ-1Kᴬ⁻⁴ The radioactive radiations are emitted in the sequence of
Options
(a) α,β,γ (b) γ,α,β (c) β,α,γ (d) γ,β,α
Correct Answer:
β,α,γ
Explanation: […]
The angle of incidence at which reflected light is totally polarised for refraction from air to glass (refractive index μ) is
Options
(a) sin⁻¹μ (b) sin⁻¹(1/μ) (c) tan⁻¹(1/μ) (d) tan⁻¹(μ)
Correct Answer:
tan⁻¹(μ)
Colours appear on a thin soap film and soap bubbles due to the phenomenon of
Options
(a) interference (b) scattering (c) diffraction (d) dispersion
Correct Answer:
interference
Explanation:
No explanation available. Be the […]
An electric dipole placed in a non-uniform electric field experiences
Options
(a) Both a torque and a net force (b) Only a force but no torque (c) Only a torque but no net […]
Two charged spheres seperated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant K=2, then the force (if all conditions are same) is […]
Zenor diode is used for
Options
(a) amplification (b) rectification (c) voltage regulation (d) produce oscillation in an oscillator
Correct Answer:
voltage regulation
Explanation:
No explanation available. Be the first to write the […]
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