NEET 20202: Bar Magnet & Earth's Magnetism Quiz (24.09.2019) for NEET & AIIMS Exams

Question 1

Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similar poles are on the same side; then its period of oscillation isT₁.Now the polarity of one of the magnets is reversed then time period of oscillations will be:

Question 2

There are four light –weight –rod sample A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observation are noted
(i) A is feebly repelled
(ii) B is feebly attracted
(iii) C is strongly attracted
(iv) D remains unaffected
Which one of the following is true ?

Question 3

Two short magnets of equal dipole moments M are fastened perpendicularly at their centres as given in the figure. The magnitude of the magnetic filed at a distance d from the centre on the bisector of the right angle is

Question 4

Two bar magnets A and B of length 10 cm are placed in a plane if the magnetic strength of the both magnets are same then find the ratio of magnetic moment of bar A to B.

Question 5

Which of the following is true?

Question 6

A permanent magnet of coercitivity 8 × 10⁴ A/m is placed inside a 50 cm long solenoid having 1000 turns. How much current should be passed in the solenoid to completely demagnetise this magnet?

Question 7

What will be the percentage increase in the magnetic field of a toroid, when the space inside the given toroid is filled by a composite material having susceptibility 9.8 × 10⁻⁵?

Question 8

In sum and difference method in vibration magnetometer, the time period is more if

Question 9

The magnetic susceptibility is negative for

Question 10

Two short magnets of equal dipole moments M are fastened perpendicularly at their centre (figure). The magnitude of the magnetic field at a distance d from the centre on the bisector of the right angle is
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Description: Description: Description: 1278