Sketch the direction of B on the above diagram. WHOSE MAGNETIC FIELD OPPOSES the

Question

Sketch the direction of B on the above diagram. WHOSE MAGNETIC FIELD OPPOSES the CHANGE in magnetic flux. (G) What will be the effect of the induced EMF when you: Q5. LENZ'S LAW states that the induced EMF will try to produce a current (a) try to reduce a magnetic field? (b) keep a magnetic field constant? (c) try to increase a magnetic field? The diagram shows a cross-section through a coil of a wire situated in a magnetic field. If B is DECREASING in magnitude with time, what will be the direction of the current produced by the induced EMF? (ii) 79

Explanation / Answer

--------------------------- Answer of Question 5.i.a -----------------------------

Induced EMF will try to increase the magnetic field.

--------------------------- Answer of Question 5.i.b -----------------------------

induced EMF will be zero.

--------------------------- Answer of Question 5.i.c -----------------------------

Induced EMF will try to decrease the magnetic field

--------------------------- Answer of Question 5.ii -----------------------------

Since it is given that B is Decreasing in magnitude with time So the imduced emf will try to flow the current in such a way that will produce the magnetic field in same direction i.e from left to right to increase the magnetic field. And to produce the magnetic field in the given direction , current will flow from lower to upper part of the cross section.

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