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JEE 2020 Physics: Magnetic Properties of Material Quiz (04.09.2019)

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Question 1

A magnet makes 30 oscillations per minute at a place where H = 0.15 × 10^–4 T. At another place, it takes 1.5 second to complete one vibration. What is the value of earth’s horizontal field at that place ?

Question 2

Two identical magnetic dipoles of magnetic moments 1.0 A-m² each, placed at a separation of 2m with their axes perpendicular to each other. The resultant magnetic field at a point midway between the dipoles is

Question 3

The magnetic lines of force inside a bar magnet

Question 4

Hysteresis loops for two magnetic material A and B are given below:

These materials are used to make magnets for electric generators, transformer core and electromagnet core. The it is proper to use:

Question 5

The materials suitable for making electromagnets should have

Question 6

Relative permittivity and permeability of a material are ε_r and μ_r, respectively. Which of the following values of these quantities are allowed for a diamagnetic material?

Question 7

Three Loops A, B, and C are placed in a uniform magnetic field directed into the plane of the paper. All current loops lie in the Z = 0 plane perpendicular to the field as shown in the figure

Question 8

A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be

Question 9

A wire bent in the shape of a regular

- polygonal loop carries a steady current

. Let ℓ be the perpendicular distance of a given segment and R be the distance of a vertex, both from the centre of the loop. The magnitude of the magnetic field at the center of the loop is given by,

Question 10

Curie temperature is the temperature above which

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Jan 19JEE & BITSAT