## Magnetic Effect Of Current And Magnetism Quiz-8

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q71. Two magnets of equal mass are joined at 90° each other as shown in figure. Magnet N1 S1 has a magnetic moment √3 times that of N2 S2. The arrangement is pivoted so that it is free to rotate in horizontal plane. When in equilibrium, what angle should N1 S1 make with magnetic meridian?

•  70°
•  60°
•  30°
•  45°
Solution

Q72.Two normal uniform magnetic fields contain a magnetic needle making an angle 60° with F. Then the ratio of F/H is
•  1 : 2
•  2∶1
•  √3 ∶1
•  1∶√3
Solution

Q73.  A short bar magnet experiences a torque of magnitude 0.64 J. When it is placed in a uniform magnetic field of 0.32 T, taking an angle of 30° with the direction of the field. The magnetic moment of the magnet is
•   1 Am2
•  4 Am2
•  6 Am2
•  None of these
Solution

Q74.A circular loop of radius 0.0157 m carries a current of 2.0 A. The magnetic field at the center of the loop is [Î¼0=4Ï€×10-7 Wb-A-1 m-1]
•  1.57×10-5 Wb-m2
•  8.0×10-5 Wb-m2
•  2.0 ×10-5 Wb-m2
•  3.14 ×10-5 Wb-m2
Solution

Q75.A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 30° and 15 oscillations per minute at a place where dip angle 60°. The ratio of total earth’s magnetic field at the two places is
•  3√3 ∶8
•  16∶9√3
•  4∶9
•  2√3 ∶9
Solution

Q76. A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of 45°. If the current be reduced by a factor of √3, the deflection would
•  Decrease by 30°
•  Decrease by 15°
• Increase by 15°
•  Increase by 30°
Solution

Q77.The magnetic field of earth is due to
•  Motion and distribution of some material in and outside the earth
•  Interaction of cosmic rays with the current of earth
•  A magnetic dipole buried at the centre of the earth
•  Induction effect of the sun
Solution
Motion and distribution of some material in and outside the earth

Q78.A bar magnet is placed north-south with its north pole due north. The points of zero magnetic field will be in which direction from center of magnet
•  North and south
•  East and west
•  North-east and south-west
•  North-east and south-east
Solution
Points of zero magnetic field ie, neutral points lie on equatorial line of magnetic ie, along east and west.

Q79.A deflection magnetometer is adjusted in the usual way. When a magnet is introduced, the deflection observed is Î¸, and the period of oscillation of the needle in the magnetometer is T. When the magnet is removed, the period of oscillation is T0. The relation between T and T0 is
•  T2=T02 cos⁡Î¸
•  T=T0 cos⁡Î¸
•  T=T0/cos⁡Î¸
•  T2=(T02)/cos⁡Î¸
Solution

Q80. A compass needle placed at a distance r from a short magnet in a tan A position shows a deflection of 60°. If the distance is increased to r(2)1/3, the deflection of compass needle is
•  30°
•  60°
•  45°
•  0°
Solution

#### Written by: AUTHORNAME

AUTHORDESCRIPTION

## Want to know more

Please fill in the details below:

## Latest NEET Articles\$type=three\$c=3\$author=hide\$comment=hide\$rm=hide\$date=hide\$snippet=hide

Name

ltr
item
BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET & IIT JEE COACHING: Magnetic-Effect-Of-Current-And-Magnetism-Quiz-8
Magnetic-Effect-Of-Current-And-Magnetism-Quiz-8