Which of the following physical quantities is an example of a vector quantity?
A. Electric current
B. Electric charge
C. Electric field intensity
D. Electric potential
Answer: Option C
Solution (By JKSSB Mock Tests)
A vector quantity possesses both magnitude and a specific spatial direction, and it must obey the laws of vector addition. Electric field intensity is a vector (force per unit charge, having the direction of the force). Electric current has a direction in circuits but adds algebraically like a scalar (violating vector addition). Charge and potential are standard scalars.
Explanation:
Microwave ovens use electromagnetic radiation in the microwave frequency range (usually around 2.45 GHz). Water molecules have a permanent electric dipole moment. The oscillating electric field of the microwaves rapidly forces the water molecules to flip back and forth to align with the field, generating thermal energy via friction and effectively heating the food from within.
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