TRUE or FALSE 1. A minus sign is required to be placed before the right hand side ofthe expression for EMF induced just to indicate the phenomenon explained by Lenz. . The reluctance of a material is defined as its ability to conduct magnetic flux. 2 3. The unit of polarization is same as that of electric field density. 4. The capacitor never dissipates energy but only stores it. 5. The current through a capacitor is zero if the voltage across it is not changing with time. 6. A capacitor is sort of open circuit to DC. 7. The charge in a capacitor is stored in dielectric field. 8. Potential of every point inside a hollow charged sphere is same. 9. Dielectric constant and permittivity are same. 10. The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity. 11. Electrostatic field is solenoidal. 12. The unit of magnetic flux density is the weber. 13. Magnetic flux flows from the north pole to the south pole within the magnet. 14. When the south poles of two bar magnets are brought close together, there will be a force of attraction. 15. Magnetic field increases as we go away from a magnet. 16. All electromagnetic waves travel with the velocity of light. 17. Radio waves, microwaves, and infrared waves all have longer wave lengths than visible light. 18. Both x-rays and gamma rays have higherfrequencies than ultraviolet rays. 19. The sun radiates both visible energy and invisible energy. 20. Communicating with satellites is an application of radio waves