JEE Advanced · 2009 · 12 Apr 2009 · Paper 1 · Electromagnetic Induction

WhatsApp Email

The figure shows certain wire segments joined together to form a coplanar loop. The loop is placed in a perpendicular magnetic field in the direction going into the plane of the figure. The magnitude of the field increases with time.

I_{1}

and

I_{2}

are the currents in the segments ab and cd. Then,

(A) $I_{1} > I_{2}$
(B) $I_{1} < I_{2}$
(C) $I_{1}$ is in the direction ba and $I_{2}$ is in the direction $cd$
(D) $I_{1}$ is in the direction ab and $I_{2}$ is in the direction dc✓ Correct

Answer: (D)

Solution

According to Lenz's law, when the magnetic field into the plane increases, an induced current will flow to oppose this change. The induced current will create a magnetic field out of the plane, which requires a counterclockwise current in the loop. Looking at the loop, the current flows counterclockwise, so in segment ab the current flows from a to b, and in segment cd the current flows from d to c. Therefore,

I_{1}

is in the direction ab and

I_{2}

is in the direction dc.

JEE Advanced · 2009 · 12 Apr 2009 · Paper 1 · Single correct option

Practise more: all JEE Advanced PYQs on Electromagnetic Induction →

JEE Advanced · 2009 · 12 Apr 2009 · Paper 1 · Electromagnetic Induction

Solution

More JEE Advanced questions on Electromagnetic Induction