Practice free Magnetic Effects of Current and Magnetism (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A line passing through places having zero value of magnetic dip is called
(d)
It is called a magnetic equator or aclinic line.
The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is
Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth’s magnetic field with magnet having magnetic moment 2M making an angle with the magnetic meridian such that
The time period of oscillation of a freely suspended bar magnet with usual notations is given by
(a)
The period of oscillation of a magnet in vibration magnetometer is 2 sec. The period of oscillation of a magnet whose magnetic moment is four times that of the first magnet is
A magnetic needle is made to vibrate in uniform field H, then its time period is T. If it vibrates in the field of intensity 4H, its time period will be
The time period of oscillation of a magnetic needle in a vibration magnetometer is inversely proportional to the square root of the magnetic field intensity. If the field intensity is increased by 4 times, the time period will decrease by a factor of 1/sqrt(4) = 1/2. Hence, the new time period will be T/2.
A bar magnet A of magnetic moment MA is found to oscillate at a frequency twice that of magnet B having identical size as magnet A, of magnetic moment MB when placed in a vibrating magneto-meter. We may say that
The frequency of oscillation of a magnet in a vibrating magnetometer is inversely proportional to the square root of its magnetic moment. If the frequency of A is twice that of B, then M_A = (2)^2 * M_B = 4M_B.
Magnets A and B are geometrically similar but the magnetic moment of A is twice that of B. If T1 and T2 be the time periods of the oscillation when their like poles and unlike poles are kept together respectively, then will be
The time period of oscillation is inversely proportional to the square root of the magnetic moment. Since A's moment is twice B's, the ratio of their periods for like poles is 1:√2. For unlike poles, it's √2:1. Hence, T1/T2 = (√2/1)*(1/√2) = 1/√3.
A magnetic needle suspended by a silk thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased by 500°C, then
. Since magnetic moment decreases with increase in temperature hence time period T increases.
The time period of oscillation of a bar magnet suspended horizontally along the magnetic meridian is T0. If this magnet is replaced by another magnet of the same size and pole strength but with double the mass, the new time period will be
The time period of oscillation of a bar magnet is directly proportional to the square root of its mass. If the mass is doubled while keeping the magnetic moment constant, the new time period will be √2 times the original period T_0.
Ready to ace NEET?
Free access · No credit card required
Yes. You can attempt every Magnetic Effects of Current and Magnetism question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.