JEE Main 2020 (Online) 4th September Morning Slot | Magnetics Question 143 | Physics

JEE Main 2020 (Online) 4th September Morning Slot

MCQ (Single Correct Answer)

-1

A small bar magnet placed with its axis
at 30^o with an external field of 0.06 T
experiences a torque of 0.018 Nm. The
minimum work required to rotate it from its
stable to unstable equilibrium position is :

6.4 $$ \times $$ 10^-2 J

9.2 $$ \times $$ 10^-3 J

7.2 $$ \times $$ 10^-2 J

11.7 $$ \times $$ 10^-3 J

JEE Main 2020 (Online) 4th September Morning Slot

MCQ (Single Correct Answer)

-1

A wire A, bent in the shape of an arc of a circle, carrying a current of 2 A and having radius 2 cm and another wire B, also bent in the shape of arc of a circle, carrying a current of 3 A and having radius of 4 cm, are placed as shown in the figure. The ratio of the magnetic fields due to the wires A and B at the common centre O is : JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetics Question 155 English

JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetics Question 155 English

4 : 6

6 : 4

2 : 5

6 : 5

JEE Main 2020 (Online) 4th September Morning Slot

MCQ (Single Correct Answer)

-1

A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil? JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetics Question 154 English

JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetics Question 154 English

Three positions shown describe :
(a) the magnet's entry
(b) magnet is completely inside and
(c) magnet's exit.

JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetics Question 154 English Option 1

JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetics Question 154 English Option 2

JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetics Question 154 English Option 3

JEE Main 2020 (Online) 4th September Morning Slot Physics - Magnetics Question 154 English Option 4

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

-1

A uniform magnetic field B exists in a direction perpendicular to the plane of a square loop made of a metal wire. The wire has a diameter of 4 mm and a total length of 30 cm. The magnetic field changes with time at a steady rate $${{dB} \over {dt}}$$ = 0.032 Ts^–1. The induced current in the loop is close to (Resistivity of the metal wire is 1.23 $$ \times $$ 10^–8 $$\Omega $$m)

0.53 A

0.43 A

0.34 A

0.61 A

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