## Magnetic Effect Of Current And Magnetism Quiz-1

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.

Q1. Magnetic intensity for an axial point due to a short bar magnet of magnetic moment M is given by
•

•

•

•

Solution

Q2.To measure which of the following , is a tangent galvanometer used
•  Charge
•  Angle
•  Current
•  Magnetic intensity
Solution
Current

Q3.  A long magnet is placed vertically with its S-pole resting on the table. A neutral point is obtained 10 cm from the pole the geographic north of it. If H=3.2×10-5T ,then the pole strength of magnet is
•   8 ab-A-cm-1
•  16 ab-A-cm-1
•  32 ab-A-cm-1
•  64 ab-A-cm-1
Solution

Q4. The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be
•  0.4 Am2
•  1.6 Am2
•  20 Am2
•  8.0 Am2
Solution
M=mL=4×10×10-2=0.4 A×m2

Q5.Two magnets held together in earth’s magnetic field with same polarity together make 12 vib-min-1and when opposite poles together make 4 vib-min-1.⁡The ratio of magnetic moments is
•  9 :1
•  1 : 3
•  1 : 9
•  10 : 8
Solution

Q6. In which direction, the magnetic field on the axis at a distance z from the centre of the bar magnet would be?
•  In the perpendicular direction of the magnetic moment (M) of the magnet
•  In the direction of the magnetic dipole moment (M) of the magnet
• Its direction depends on the magnitude of the magnetic moment (M) of the magnet
•  In the opposite direction of the magnetic dipole moment(M) of the magnet
Solution
In the perpendicular direction of the magnetic moment (M) of the magnet

Q7.Two short magnets have equal pole strengths but one is twice as long as other. The shorter magnet is placed 20 cm in tanA position from the compass needle. The longer magnet must be placed on the other side of the magnetometer for no deflection at a distance equal to
•  20 cm
•  20×(2)1/3 cm
•  20×(2)2/3 cm
•  20×(2) cm
Solution

Q8.Electromagnets are made of soft iron because soft iron has
•  Low susceptibility and low retentivity
•  Low susceptibility and high retentivity
•  High permeability and low retentivity
•  High permeability and high coercivity
Solution
Electromagnets are made of soft iron because soft iron has high permeability and low retentivity

Q9.A long magnet is cut into two equal parts, such that the length of each half is same as that of original magnet. If the period of original magnetic is T, the period of new magnet is
•  T
•  T/2
•  T/4
•  2T
Solution

Q10. If the B-H curves of two samples of P and Q of iron are as shown below, then which one of the following statements is correct?
•  Both P and Q are suitable for making permanent magnet
•  P is suitable for making permanent magnet and Q for making electromagnet
•  P is suitable for making electromagnet and Q is suitable for permanent magnet
• Both P and Q are suitable for making electromagnets
Solution
For permanent magnet we prefer a material with high retentivity (so as to make a stronger magnet) and high coercivity (so that magnetization may not be wiped out easily). For electromagnet we prefer high saturated magnetism, low coercivity and least possible area of hysteresis loop so that electromagnet develops high magnetization, is easily demagnetized and energy loss in a magnetization cycle is least. Therefore, P is suitable for making permanent magnet and Q for making electromagnet.

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