Which of the following physical quantities has the same dimensional formula as that of pressure? MCQ with Answer and Explanation

Explanation:
Electromagnetic induction (changing magnetic flux induces EMF) is the principle behind generators (mechanical energy to electrical) and transformers (AC voltage conversion). Electric motors work on the reverse principle: force on current-carrying conductor in magnetic field. Memory aid: 'Induction applications: generators, transformers, induction cooktops; motors use motor effect'. This application question tests electromagnetism fundamentals, frequently examined in competitive exams. Always distinguish induction (generator/transformer) from motor effect (motor); competitive exams often combine both in device-based questions.

Explanation:
Newton is a derived unit representing force, defined as kg·m/s². Kelvin (temperature), Ampere (current), and Mole (amount of substance) are fundamental SI units. Derived units are combinations of fundamental units through physical relationships. Newton comes from Newton's second law: F = ma. Memory aid: Remember the seven fundamental SI units: meter, kilogram, second, ampere, kelvin, mole, candela. All others like newton, joule, watt are derived. This distinction is essential for unit conversion questions in competitive exams.

Explanation:
Voltmeter measures potential difference in volts. Connected in parallel. Ideal voltmeter has infinite resistance. Galvanometer can be converted to voltmeter by adding high resistance in series.