## Magnetic Effect Of Current And Magnetism Quiz-7

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.

Q61. A magnet freely suspended in a vibration magnetometer makes 40 oscillations per minute at a place A and 20 oscillations per minute at a place B. If the horizontal component of earth’s magnetic field at A is 36×10-6T, then its value at B is
•  36×10-6T
•  9×10-6T
•  144×10-6T
•  228×10-6T
Solution

Q62.Tangent galvanometer measures
•  Capacitance
•  Current
•  Resistance
•  Potential difference
Solution

Q63.  At a certain place the horizontal component of the earth’s magnetic field is B0 and the angle of dip is 45°. The total intensity of the field at that place will be
•   B0
•  √2 B0
•  2 B0
•  B02
Solution

Q64. If a bar magnet of length l and cross-sectional area A is cut into two equal parts as shown in figure, then the pole strength of each pole becomes
•  Half
•  Double
•  One-fourth
•  Four time
Solution
Pole strength depends on material of magnet, state of magnetization and cross-sectional area. As m∝A, so if A becomes half, pole strength gets half.

Q65.At a point on the right bisector of a magnetic dipole magnetic
•  Potential varies as 1/r2
•  Potential is zero at all points on the right bisector
•  Field varies as r2
•  Field is perpendicular to the axis of dipole
Solution

Q66. Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as
•  Square of the distance
• Cube of the distance
•  Distance
•  Fourth power of the distance
Solution
Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as

Q67.

•

•

•

•

Solution

Q68.A dip needle which is free to move in a vertical plane perpendicular to magnetic meridian will remain
•  Horizontal
•  Vertical
•  Neither horizontal nor vertical
•  Inclined
Solution

Q69.Relative permittivity and permeability of a material are Îµr and Î¼r, respectively. Which of the following values of these quantities are allowed for a diamagnetic material?
•  Îµr=0.5,Î¼r=1.5
•  Îµr=1.5,Î¼r=0.5
•  Îµr=0.5,Î¼r=0.5
•  Îµr=1.5,Î¼r=1.5
Solution
For diamagnetic material, 0<Î¼r<1 and for any material Îµ<r<1.

Q70. At a place the angle of dip is 30°. If the horizontal component of earth’s magnetic field is BH, then the total field intensity is
•  BH/2
•  (2BH)/√3
•  BH √2
• BH √3
Solution

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