Explore topic-wise MCQs in Physics.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

A horizontal overhead power line carries a current of 100A in east to west direction. What is the magnitude and direction of the magnetic field due to the current, 2 m below the line?

A. 3 x 10<sup>-5</sup> T
B. 2 x 10<sup>-5</sup> T
C. 1 x 10<sup>-5</sup> T
D. 4 x 10<sup>-5</sup> T
Answer» D. 4 x 10<sup>-5</sup> T
Discussion
2.

When an arc of a circle of radius R subtends an angle of ( frac { pi }{4} ) at the center, and carries a current I, the magnetic field at the center is B = ( frac { mu_o I}{16R} ).

A. True
B. False
Answer» B. False
Discussion
3.

The magnetic field due to a current carrying circular loop of radius 4 cm at a point on the axis at a distance of 7 cm from the center is 48 T. What will be the value at the center of the loop?

A. 390 T
B. 393 T
C. 395 T
D. 397 T
Answer» C. 395 T
Discussion
4.

Identify the expression for the magnetic field on the axis of circular loop.

A. B= ( frac { mu_o Ir}{4 pi big ( (r^2 , + , x^2)^{ frac {1}{2}} big ] } ) 2 r
B. B= ( frac { mu_o Ir}{4 pi big ( (r^2 , + , x^2)^{ frac {3}{2}} big ] } )
C. B= ( frac { mu_o Ir}{4 pi big ( (r^2 , + , x^2)^{ frac {3}{2}} big ] } ) 2 r
D. B= ( frac { mu_o Ir}{4 pi big ( (r^2 , + , x^2)^{ frac {1}{2}} big ] } ) 4 r
Answer» D. B= ( frac { mu_o Ir}{4 pi big ( (r^2 , + , x^2)^{ frac {1}{2}} big ] } ) 4 r
Discussion
5.

Pick out the expression for magnetic field strength at any point at the center of a circular loop from the following?

A. B = ( [ frac { mu_o I}{4 pi r} ] int_0^{2 pi r} )dl sin u206190
B. B = ( [ frac { mu_o I}{4 pi r} ] int_0^{2 pi r} )dl sin u206145
C. B = ( [ frac { mu_o I}{4 pi r} ] int_0^{2 pi r} )dl sin u206130
D. B = [ <sub>o</sub> 4 r] ( int_0^{2 pi r} )dl sin u206190
Answer» B. B = ( [ frac { mu_o I}{4 pi r} ] int_0^{2 pi r} )dl sin u206145
Discussion