CBSE Class 12 Physics Magnetism and Matter Quiz 2

1. A current carrying power line carries current from west to east. What will be direction of magnetic field 1 meter above it?

A N to S B S to N C E to W D W to E

2. The dimensional representation of \(\sqrt{l/MB}\) is similar to that of:

A frequency B time C distance D speed

3. On quadrupling the moment of inertia of a magnet, its frequency of oscillation will become:

A half B double C four times D one-fourth

4. The magnetic field strength due to a short bar magnet directed along its axial line at a distance r is B. What is its value at the same distance along the equatorial line?

A B B 2B C \(\frac{B}{2}\) D \(\frac{B}{4}\)

5. The neutral point in the magnetic field of a horizontally placed bar magnet is a point where the magnetic field due to that bar magnet is:

A zero B more than that of earth C less than that of earth D equal to that of earth

6. In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is :

A exponential B linear C algebraic D logarithmic

7. The force between two parallel wire 2 × 10^-7 Nm^-1, placed 1 m apart to each other in vacuum. The electric current flowing through the wires is:

A 1 A B zero C 5 × 10⁶ A D 2 × 10^-7 A

8. The force acting per unit length of a semi circular wire of radius R carrying a current I is:

A \(\frac{µ_0l^2}{4R}\) B \(\frac{µ_0l^2}{2R}\) C \(\frac{µ_0l^2}{R}\) D \(\frac{2µ_0l^2}{R}\)

9. Which of the following has higher magnetic susceptibility?

A diamagnetic B paramagnetic C ferromagnetic D None of these

10. The magnetic field of earth is due to:

A induction effect of the sun B the presence of a large magnet at the centre of the earth C interaction of cosmic rays with the current of earth D motion and distribution of some material in an outside the earth