JEE Main 2021 (Online) 18th March Morning Shift | Magnetic Effect of Current Question 146 | Physics

Four identical long solenoids A, B, C and D are connected to each other as shown in the figure. If the magnetic field at the center of A is 3T, the field at the center of C would be : (Assume that the magnetic field is confined with in the volume of respective solenoid).

JEE Main 2021 (Online) 18th March Morning Shift Physics - Magnetic Effect of Current Question 147 English

12T

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-1

A loop of flexible wire of irregular shape carrying current is placed in an external magnetic field. Identify the effect of the field on the wire.

Loop assumes circular shape with its plane normal to the field.

Loop assumes circular shape with its plane parallel to the field.

Wire gets stretched to become straight.

Shape of the loop remains unchanged.

JEE Main 2021 (Online) 17th March Evening Shift

MCQ (Single Correct Answer)

-1

A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point P which lies on the centre of the semicircle?

JEE Main 2021 (Online) 17th March Evening Shift Physics - Magnetic Effect of Current Question 148 English

JEE Main 2021 (Online) 17th March Evening Shift Physics - Magnetic Effect of Current Question 148 English

$${{{\mu _0}I} \over {4\pi r}}(2 - \pi )$$

$${{{\mu _0}I} \over {2\pi r}}(2 - \pi )$$

$${{{\mu _0}I} \over {4\pi r}}(2 + \pi )$$

$${{{\mu _0}I} \over {2\pi r}}(2 + \pi )$$

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated windings of the solenoid carry an electric current of 5A. The magnetic flux density produced by the solenoid is : (permeability of free space = 4$$\pi$$ $$\times$$ 10^$$-$$7 H/m)

$$\pi$$T

2 $$\times$$ 10^$$-$$3$$\pi$$ T

10^$$-$$4$$\pi$$ T

$${\pi \over 5}$$ T

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