If an electromagnetic wave of frequency \(f= 3\) MHz passes from vacuum into a dielectric medium with relative permittivity \(K = 4.0\), then:

1.	wavelength is \(2\) times and frequency becomes half.
2.	wavelength is half and frequency remains unchanged.
3.	wavelength and frequency both remain unchanged.
4.	None of the above.

The most penetrating radiation out of the following is:
1. \(X\text-\)rays
2. \(\beta\text-\)rays
3. \(\alpha\text-\)rays
4. \(\gamma\text-\)rays

Which of the following statements is false regarding the properties of electromagnetic waves?

In an electromagnetic wave, energy density associated with a magnetic field will be:

1. $\frac{1}{2}L{I}^2$

2. $\frac{B^2}{2{\mu }_0}$

3. $\frac{1}{2}{\mu }_0{B}^2$

4. $\frac{1}{2}\frac{q}{B^2}$

Instantaneous displacement current of \(2.0~\text A\) is set up in the space between two parallel plates of \(1~\mu \text{F}\)$$ capacitor. The rate of change in potential difference across the capacitor is:
1. \(3\times 10^{6}~\text{V/s}\)
2. \(4\times 10^{6}~\text{V/s}\)
3. \(2\times 10^{6}~\text{V/s}\)
4. None of these

A variable frequency AC source is connected to a capacitor. Then on increasing the frequency: