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### The speed of electromagnetic waves in vaccum is equal to

The speed of electromagnetic waves in vaccum is equal to

Options

(a) μ₀ε₀ (b) √(μ₀ε₀) (c) 1/√(μ₀ε₀) (d) 1/(μ₀ε₀)

1/√(μ₀ε₀)

Explanation:

According to Maxwelll, it is found that the electromagnetic waves […]

### Two thin long conductors seprated by a distance d carry currents

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

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

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

90⁰

Explanation:

Consider the diagram where […]

### In a given reaction, ᴢXᴬ → ᴢ+1Yᴬ → ᴢ-1Kᴬ⁻⁴ → ᴢ-1Kᴬ⁻⁴

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

β,α,γ

Explanation: […]

### The angle of incidence at which reflected light is totally polarised for refraction

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)

tan⁻¹(μ)

### Colours appear on a thin soap film and soap bubbles due to the phenomenon of

Colours appear on a thin soap film and soap bubbles due to the phenomenon of

Options

(a) interference (b) scattering (c) diffraction (d) dispersion

interference

Explanation:

No explanation available. Be the […]

### An electric dipole placed in a non-uniform electric field experiences

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.

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

Zenor diode is used for

Options

(a) amplification (b) rectification (c) voltage regulation (d) produce oscillation in an oscillator