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Question

Physics Question on Electromagnetic waves

Velocity of light is equal to

A

ε0μ0\sqrt{\varepsilon_{0}\mu_{0}}

B

ε0/μ0\sqrt{\varepsilon_{0}/\mu_{0}}

C

ε0/μ0{\varepsilon_{0}/\mu_{0}}

D

1ε0μ0\sqrt{\frac{1}{\varepsilon_{0}\mu_{0}}}

Answer

1ε0μ0\sqrt{\frac{1}{\varepsilon_{0}\mu_{0}}}

Explanation

Solution

Change in magnetic flux (ϕ)=2×10−2Wb(\phi)=2 \times 10^{-2} Wb and change in current (I)=0.01A( I )=0.01 A. Change in magnetic flux, ϕ=2×10−2=Ml\phi=2 \times 10^{-2}= Ml =M×0.01= M \times 0.01 or M=2×10−20.01=2HM=\frac{2 \times 10^{-2}}{0.01}=2 H (where M=M = coefficient of mutual inductance).