## Biot-Savart's Law - MCQ-Basic

Physics is an important subject in preparation for various Competitive exams.To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Biot-Savart's Law. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be

•  2nB
•  n2B
•  nB
•  2n2B

n2B

Q2. The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54uT . What will be its value at the centre of the loop

•  125 uT
•  150 uT
•  250 uT
•  75 uT

250 uT

Q3. A circular coil of radius R carries an electric current. The magnetic field due the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as

•  1/r
•  1/r3/2
•  1/r2
•  1/r3

1/r3

Q4. A current flows in a conductor from east to west. The direction of the magnetic field at a point above the conductor is

•  Towards west
•  Towards east
•  Towards south
•  Towards north

Towards north

Q5. The earth’s magnetic field at a given point is 0.5 X 10 -5Wb m-2 . This field is to be annulled by magnetic induction at the centre of a circular conducting loop of radius 5.0 cm. The current required to be flown in the loop is nearly

•  0.2 A
•  0.4 A
•  4 A
•  40 A

0.4 A

Q6. Which is a vector quantity

•  Flux density
•  Magnetic flux
•  Intensity of magnetic flux
•  Magnetic potential

Intensity of magnetic flux

Q7. Two similar coils are kept mutually perpendicular such that the centre coincide. At the centre, find the ratio of the magnetic field due to one coil the resultant magnetic field. By both coils, if the same current is flown

•  1:√2
•  1 : 2
•  2 : 1
•  √3:1

1:√2

Q8. A wire in the form of a circular loop of one turn carrying a current produces a magnetic field B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is

•  5 B
•  3 B
•  2 B
•  4 B

4 B

Q9. A circular loop of radius R, carrying current i, lies in XY-plane with its centre at origin. The total magnetic flux through X-Y plane is

•  Directly proportional to R
•  Directly proportional to i
•  Inversely proportional to i both the electrodes
•  Zero

Zero

Q10. A magnetic field can be produced by

•  A moving charge
•  A changing electric field
•  None of these
•  Both of these

Both of these

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