1
NEET 2023 Manipur
+4
-1

The variation of susceptibility $$(\chi)$$ with absolute temperature ( $$\mathrm{T}$$ ) for a paramagnetic material is represented as :

A B C D 2
NEET 2022 Phase 1
+4
-1

A big circular coil of 1000 turns and average radius 10 m is rotating about its horizontal diameter at 2 rad s$$-$$1. If the vertical component of earth's magnetic field at that place is 2 $$\times$$ 10$$-$$5 T and electrical resistance of the coil is 12.56 $$\Omega$$, then the maximum induced current in the coil will be

A
0.25 A
B
1.5 A
C
1 A
D
2 A
3
NEET 2021
+4
-1
A thick current carrying cable of radius 'R' carries current 'I' uniformly distributed across its cross section. The variation of magnetic field B(r) due to the cable with the distance 'r' from the axis of the cable is represented by :
A B C D 4
NEET 2021
+4
-1
In the product

$$\overrightarrow F = q\left( {\overrightarrow v \times \overrightarrow B } \right)$$

$$= q\overrightarrow v \times \left( {B\widehat i + B\widehat j + {B_0}\widehat k} \right)$$

For q = 1 and $$\overrightarrow v = 2\widehat i + 4\widehat j + 6\widehat k$$ and $$\overrightarrow F = 4\widehat i - 20\widehat j + 12\widehat k$$

What will be the complete expression for $$\overrightarrow B$$ ?
A
$$6\widehat i + 6\widehat j - 8\widehat k$$
B
$$- 8\widehat i - 8\widehat j - 6\widehat k$$
C
$$- 6\widehat i - 6\widehat j - 8\widehat k$$
D
$$8\widehat i + 8\widehat j - 6\widehat k$$
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