TS EAMCET 2022 (Online) 18th July Evening Shift | Magnetism and Matter Question 21 | Physics

Assertion (A) The magnetic field lines are continuous and form closed loops. Reason (R) Magnetic monopole does not exist. The correct option among the following is

(A) is true, (R) is true and (R) is the correct explanation for (A).

(A) is true, (R) is true but (R) is not the correct explanation for $(A)$.

(A) is true but (R) is false.

(A) is false but (R) is true.

TS EAMCET 2022 (Online) 18th July Morning Shift

MCQ (Single Correct Answer)

-0

A planet has magnetic dipole moment of $27 \times 10^{22} \mathrm{~A}-\mathrm{m}^2$. If the radius of the planet is 300 km , what would be the magnetic field at its equator? $\left(\right.$ use,$\left.\frac{\mu}{4 \pi}=10^{-7}\right)$

1 T

27 T

11 T

30 T

TS EAMCET 2020 (Online) 14th September Evening Shift

MCQ (Single Correct Answer)

-0

Which of the following is desirable for making permanent magnets?

Low coercive field and low retentivity

Low coercive field and high retentivity

High coercive field and high retentivity

High coercive field and low retentivity

TS EAMCET 2020 (Online) 14th September Morning Shift

MCQ (Single Correct Answer)

-0

A short bar magnet placed with its axis at $30^{\circ}$ with an external field of 800 G experiences a torque of 0.016 Nm . The magnetic moment of the bar magnet is

$0.4 \mathrm{Am}^2$

$0.5 \mathrm{Am}^2$

$0.6 \mathrm{Am}^2$

$0.7 \mathrm{Am}^2$

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