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Magnetic Effect Of Current MCQ Level - 1


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Magnetic Effect Of Current MCQ Level - 1 for Physics 2022 is part of Topic wise Tests for IIT JAM Physics preparation. The Magnetic Effect Of Current MCQ Level - 1 questions and answers have been prepared according to the Physics exam syllabus.The Magnetic Effect Of Current MCQ Level - 1 MCQs are made for Physics 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Magnetic Effect Of Current MCQ Level - 1 below.
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Magnetic Effect Of Current MCQ Level - 1 - Question 1

A current i is flowing in a straight conductor of length L. The magnetic induction at a point distant L/4 from its centre will be :

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 1


Magnetic Effect Of Current MCQ Level - 1 - Question 2

A long solenoid carrying a current produce’s a magnetic field B along its axis. If the current is doubled acid the number of turns per cm  is halved, the new value of the magnetic field is :

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 2


The correct answer is: B

Magnetic Effect Of Current MCQ Level - 1 - Question 3

For paramagnetic materials magnetic susceptibility is related with temperature as :

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 3

For paramagnetic materials magnetic susceptibility is inversely proportional to the temperature i.e., proportional to  T–1.
The correct answer is: ∝T-1

Magnetic Effect Of Current MCQ Level - 1 - Question 4

An electron and proton enter a uniform magnetic field perpendicular. Both have same kinetic energy. Which of the following is true?

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 4

When a charged particle enters a magnetic field perpendicularly, it moves on a circular path. The required centripetal force is provided by magnetic force.

i.e. magnetic force = Centripetal force.

Now kinetic energy of the particle 

Therefore, Eq. (1) become

Hence trajectory of proton is less curved.

The correct answer is: Trajectory of proton is less curved

Magnetic Effect Of Current MCQ Level - 1 - Question 5

A charge of 10–6C is describing a circular path of radius 1cm making 5 revolution per second.  The magnetic induction field at the centre of the circle is :

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 5


The correct answer is: 

Magnetic Effect Of Current MCQ Level - 1 - Question 6

A charged particle enters a uniform magnetic field with velocity vector at an angle of 45° with the magnetic field. The pitch of the helical path followed by the particle is  p. The radius of the helix will be :

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 6

The correct answer is:  

Magnetic Effect Of Current MCQ Level - 1 - Question 7

A charged particle (charge  q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment µ is given by :

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 7

As revolving charge is equivalent to a current, so



where R is radius of circle and v is uniform speed of charged particle.

Now, magnetic moment associated with charged particle is given by

Magnetic Effect Of Current MCQ Level - 1 - Question 8

The magnetic induction at centre O  in the following figure will be

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 8

Magnetic Effect Of Current MCQ Level - 1 - Question 9

A current carrying wire is bent in the L shape as shown in figure. The length of both arms extend to infinity. Then, the magnetic field at O is

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 9

Magnetic Effect Of Current MCQ Level - 1 - Question 10

A current loop consists of two identical semicircular parts each of radius R, one lying in the x - y plane and the other in x - z plane. If the current in the loop is i. The resultant magnetic field due to the two semiconductor parts at their common centre is :

Detailed Solution for Magnetic Effect Of Current MCQ Level - 1 - Question 10

The loop mentioned in the question must look like one as shown in the figure.

Magnetic field at the centre due to semicircular loop lying in x-y plane.

 in negative z direction.

Similarly field due to loop in x-z plane, in negative y direction.

∴ Magnetic of resultant magnetic field,

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