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Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Class 10 MCQ


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15 Questions MCQ Test - Science Olympiad Test: Magnetic Effects of Electric Current- 2

Science Olympiad Test: Magnetic Effects of Electric Current- 2 for Class 10 2024 is part of Class 10 preparation. The Science Olympiad Test: Magnetic Effects of Electric Current- 2 questions and answers have been prepared according to the Class 10 exam syllabus.The Science Olympiad Test: Magnetic Effects of Electric Current- 2 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Science Olympiad Test: Magnetic Effects of Electric Current- 2 below.
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Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 1

Commercial electric motors do not use

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 1
  • Commercial electric motors require large magnetic field which they obtain using a solenoid having large number of turns with a soft iron core at the centre.
  • The magnetic field due to solenoid is
    B α nI
  • Large number of turns (n) provide large magnetic field at the centre.
  • A permanent magnet is a weak magnet which is unable to provide the large magnetic field require for commercial applications.
Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 2

An electric bulb rated 220 V is connected to 220 V, 5 Hz AC source. The bulb

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 2

5 Hz means that the bulb glows only 5 times in a second. For the bulb  to appear as glowing continuously, the frequency of AC should be at least 16 Hz.

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Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 3

The magnetic field inside a long straight solenoid carrying current

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 3

The magnetic field for a point inside a long straight current-carrying solenoid is double then for a point situated at one of its ends.

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 4

An induced emf is produced when a magnet is plunged into a coil. The magnetic field of induced emf does not depend on

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 4

The magnitude of induced emf is given by,

Which depends upon number of turns (N), magnetic field intensity (B) which depends upon medium, rate of change of area (ds/dt) which depends upon insertion speed of magnet. It is independent of resistance of coil.

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 5

An AC of frequency 50 Hz changes its polarity after every

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 5

In India the frequency of AC is 50 Hz which means that AC changes its polarity after 1/100 s
(i.e., 100 times per second) as it complete one cycle i.e., from + ve to –ve and from –ve to + ve 1/50 sec.

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 6

What material is used to make a fuse wire?

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 6
  • The fuse wire is made up of Sn (tin) and Pb (lead) alloy because of its high resistance and low melting point. 
  • The tin and lead alloy is a eutectic composition(low melting point composition) consisting of 62% tin plus 38% lead.
  • Melting point of this alloy is 1830C
  • In case of short circuit when a high current flows through the fuse wire then due to overheating, the fuse wire melts and breaks the circuit.
  • As the circuit breaks, the household electrical components are saved from damage due to the high current.
Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 7

 In case of a current-carrying circular coil, the magnetic field is maximum

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 7


The two magnetic fields, each due to the semicircular segment of the coil through A and B, assist each other as we move towards the centre of the coil.

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 8

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, then the new value of magnetic field is

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 8

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 9

The magnetic field at a distance of 10 cm from a long wire carrying current is 2 tesla. The magnetic field at a distance of 20 cm is

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 9

Magnetic field ∝ 1/r
When r doubles (10 cm to 20 cm), the magnetic field becomes half (2 T → 1 T)

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 10

A straight wire of mass 200 g and length 1.5 m carries a current of 2A. It is suspended in mid air by a uniform horizontal magnetic field whose magnitude in Tesla is

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 10

It has been found that Force (F) acting on a current-carrying conductor placed on a magnetic field, in a direction perpendicular to the direction of the magnetic field, is directly proportional to the current, length of the conductor and magnitude of the field F = k I l B. In SI units, constant k = 1 Also, Force acting on a suspended mass = mg ⇒ mg = I l b

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 11

When a charged particle moving with the same velocity is subjected to magnetic field, the force acting on it is non-zero. This implies that

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 11

No force acts on a charged particle when it is moving either parallel (0°) or antiparallel (180°) to the magnetic field. In all other cases, the charged particle experience a force.

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 12

A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 12

The direction of the induced current varies once every half revolution when a rectangular coil is rotated in a magnetic field. As a consequence, the current in the coil continues to flow in the same direction.

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 13

What is the current rating of power switch current in our household circuit?

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 13

15 Amperes current rating circuits are used for higher power consumption sources that have a high power rating. It includes an air conditioner, geysers and iron box.

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 14

What is the potential difference of current in Indian household circuit?

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 14

Potential difference between a live wire and a neutral wire in a domestic circuits it 220 V and the frequency of an AC is 50 Hz.

Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 15

Which polarity is developed on the face of the solenoid when a north pole of a magnet is moving towards it?

Detailed Solution for Science Olympiad Test: Magnetic Effects of Electric Current- 2 - Question 15

When Magnet moves with its North pole towards the coil, emf is induced in the coil as the magnetic flux through the coil changes. So, when seeing from magnet side the direction of induced current appears to be Anticlockwise.

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