CBSE Class 12 Physics Magnetic Effect of Current Solved Examples.

Read and download free pdf of CBSE Class 12 Physics Magnetic Effect of Current Solved Examples.. Students and teachers of Class 12 Physics can get free advanced study material, revision notes, sure shot questions and answers for Class 12 Physics prepared as per the latest syllabus and examination guidelines in your school. Class 12 students should download this study material which will give them more knowledge for all chapters in Physics and all important topics which are scoring and can get you more marks. Students should also download free pdf of Chapter wise Notes for Class 12 Physics prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this year and also download free worksheets and question papers available here to get higher scores in school exams and tests, also click here for more Study Material for Class 12 Physics

Study Material for Class 12 Physics Chapter 6 Electromagnetic Induction

Class 12 Physics students should refer to the following Pdf for Chapter 6 Electromagnetic Induction in Class 12. These notes and test paper with questions and answers for Class 12 Physics will be very useful for exams and help you to score good marks

Class 12 Physics Chapter 6 Electromagnetic Induction

CBSE Class 12 Physics Magnetic Effect of Current Solved Examples.. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

Ex.1 For the magnetic field, due to a small element of a current carrying conductor at a point to be maximum, the angle between the element and the line joining the element to point P must be-
(A) 0º (B) 90º (C) 180º (D) 45º

Sol. (B)
dB = μ0 idlsinθ/4π2
When θ = 90º, then dB will be maximum.

Ex.2 A current of 30 A is flowing in a vertical straight wire. If the horizontal component of earth's magnetic field is 2 x 10-5 Tesla then the position of null point will be-
(A) 0.9 m (B) 0.3 mm (C) 0.3 cm (D) 0.3 m

class_12_physics_useful_0390

Ex.3 A length L of wire carrying current I is bent into a circle of one turn. The field at the center of the coil is B1. A similar wire of length L carrying current I is bent into a square of one turn. The field at its center is B2. Then-
(A)
 B1B2(B)  B1 < B2(C)  B1 = B2 (D) Nothing can be predicted.

class_12_physics_useful_0391

Ex.4 If a uniform wire loop is connected to the terminals of a battery then the magnetic induction at the centre will be-
(A) zero (B) infinite (C) directly proportional to applied e.m.f. (D) inversely proportional to the radius of the loop.
Sol. (A)

class_12_physics_useful_0392

class_12_physics_useful_0393

Ex.6 A current i is flowing in a conductor shaped as shown in the figure. The radius of curved part is r and length of straight portions is very large. The value of magnetic field at the centre will be-

class_12_physics_useful_0394

Ex.7 Electric currents i1 and i2 are flowing in two mutually perpendicular conductors as shown in the figure. The equation of zero magnetic field points will be-

class_12_physics_useful_0395

Ex.8 In the above problem the locus of zero magnetic field points will be-
(A) a circle (B) an ellipse (C) a straight line (D) a parabola
Sol. (C) y =i1/i2 x, y = mx where m = 
i1/i2
This is the equation of a straight line passing
through origin.
Ex.9 In the above problems the points of zero magnetic field are-
(A) C (B) C and D (C) D and E (D) E

Please click on below link to download pdf file for CBSE Class 12 Physics Magnetic Effect of Current Solved Examples.

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