NDA Magnetic Effects of Electric Current — practice questions
15 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NDA Magnetic Effects of Electric Current in the app →Oersted's discovery (1820) was that:Magnetic field lines:Right-hand thumb rule: if the thumb of the right hand points along the direction of current in a straight wireThe magnetic field inside a long solenoid (with n turns per unit length, carrying current I) is:Fleming's left-hand rule gives the direction of:An electric motor converts:Electromagnetic induction is the phenomenon of:AC (Alternating Current) reverses its direction every:The colour code in Indian household wiring is: live = red/brown, neutral = black/blue, earth =:Earthing of an electrical appliance:A short-circuit happens when:An electromagnet differs from a permanent magnet in that the electromagnet:Direction of force on a current-carrying conductor placed in a magnetic field is reversed if:The Earth's magnetic field is roughly comparable to that of:Frequency of AC in India is: