QUESTION BANK OF PROBABLE QUESTIONS FOR AISSCE 2016 CHAPTER – 6 (ELECTROMAGNETIC INDUCTION) Questions that have been asked one time VERY SHORT ANSWER QUESTIONS (1 MARK) How does the mutual inductance of a pair of coils change when distance between the coils is increased and number of turns in the coils is increased? [CBSE (AI) 2013] Ans. (i) Decreases (ii) Increases The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping? [CBSE (AI) 2013] Ans. As the plate oscillates, the changing magnetic flux through the plate produces a strong eddy current in the direction which opposes the cause. Also, copper being diamagnetic substance, it gets magnetized in the opposite direction, so the plate motion gets damped. The closed loop PQRS is moving into a uniform magnetic field acting at right angles to the plane of the paper as shown. State the direction of the induced current in the loop. [CBSE (AI) 2012] X X X X X P Q X X X X X X X X X X X X X X X X X X X X X X X X X R S
QUESTION BANK OF PROBABLE QUESTIONS FOR AISSCE 2016 CHAPTER – 6 (ELECTROMAGNETIC INDUCTION) Questions that have been asked one time VERY SHORT ANSWER QUESTIONS (1 MARK) How does the mutual inductance of a pair of coils change when distance between the coils is increased and number of turns in the coils is increased? [CBSE (AI) 2013] Ans. (i) Decreases (ii) Increases The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping? [CBSE (AI) 2013] Ans. As the plate oscillates, the changing magnetic flux through the plate produces a strong eddy current in the direction which opposes the cause. Also, copper being diamagnetic substance, it gets magnetized in the opposite direction, so the plate motion gets damped. The closed loop PQRS is moving into a uniform magnetic field acting at right angles to the plane of the paper as shown. State the direction of the induced current in the loop. [CBSE (AI) 2012] X X X X X P Q X X X X X X X X X X X X X X X X X X X X X X X X X R S
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