Two metallic rings A and B , identical in shape and size but having different resistivities _A and _B , are kept on top of two identical solenoids as shown in the figure. When current I is switched on in both the

Correct answer: B. _A h_B . Hence, v_A>v_B as (h=(v^2)/(2 g)) . If _A> _B , then, I_A I_B . In this case given condition can be fulfilled of m_A ≤ m_B.

JEE Advanced 2009Paper 2

Exam: JEE Advanced
Year: 2009
Paper: Paper 2
Subject: Physics
Chapter: Magnetic Effects of Current

JEE Advanced 2009 · Paper 2 · Physics · Magnetic Effects of Current

Two metallic rings A and B , identical in shape and size but having...

Two metallic rings

A

and

B

, identical in shape and size but having different resistivities

\rho_A

and

\rho_B

, are kept on top of two identical solenoids as shown in the figure. When current

I

is switched on in both the solenoids in identical manner, the rings

A

and

B

jump to heights

h_A

and

h_B

, respectively, with

h_A>h_B

. The possible relation(s) between their resistivities and their masses

m_A

and

m_B

is(are)

Two metallic rings A and B , identical in shape and size but having different resistivities _A and _B , are kept on top

Options

A $\rho_A>\rho_B$ and $m_A=m_B$
B $\rho_A < \rho_B$ and $m_A=m_B$
C $\rho_A>\rho_B$ and $m_A>m_B$
D $\rho_A < \rho_B$ and $m_A < m_B$

Correct answer

B. $\rho_A < \rho_B$ and $m_A=m_B$

Step-by-step solution

Induced emf

e=-\frac{d \phi}{d t}

. For identical rings induced emf will be same. But currents will be different. Given

h_A>h_B

. Hence,

v_A>v_B

as \left(h=\frac{v^2}{2 g}\right)

. If

\rho_A>\rho_B

, then,

I_A < I_B

. In this case given condition can be fulfilled if

m_A < m_B

. If

\rho_A < \rho_B

, then

I_A>I_B

. In this case given condition can be fulfilled of

m_A \leq m_B.

Practice Magnetic Effects of Current on Quantrex Academy →

More from Magnetic Effects of Current

A hollow, right circular cone of base radius R and height h , with its tip at the origin… JEE Advanced 2026 In a vacuum chamber, a particle of charge 1\ and mass 1 mg is projected with a velocity (… JEE Advanced 2026 A current carrying circular loop of radius 2 cm with unit normal n = k + i 2 is placed in… JEE Main 2026 A 5 mg particle carrying a charge of 5π× 10^ -6 C is moving with velocity of (3 i +2 k )×… JEE Main 2026 A current of 30 A each flows in opposite directions in two conducting wires, placed… JEE Main 2026 A small cube of side 1 mm is placed at the centre of a circular loop of radius 10 cm… JEE Main 2026 The charged particle moving in a uniform magnetic field of (3 i + 2 j ) T has an… JEE Main 2026 A circular coil of radius 2 cm and 125 turns carries a current of 1 A. The coil is placed… JEE Main 2026 Full Magnetic Effects of Current list All JEE Advanced PYQs