1
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+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
2
NEET 2021
MCQ (Single Correct Answer)
+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
NEET 2021 Physics - Magnetism and Matter Question 5 English Option 1
B
NEET 2021 Physics - Magnetism and Matter Question 5 English Option 2
C
NEET 2021 Physics - Magnetism and Matter Question 5 English Option 3
D
NEET 2021 Physics - Magnetism and Matter Question 5 English Option 4
3
NEET 2021
MCQ (Single Correct Answer)
+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
$$8\widehat i + 8\widehat j - 6\widehat k$$
4
NEET 2021
MCQ (Single Correct Answer)
+4
-1
A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of ,

(i) an equilateral tringle of side 'a'

(ii) A square of side 'a'

The magnetic dipole moments of the coil in each case respectively are :
A
4Ia2 and 3Ia2
B
$$\sqrt 3 $$ Ia2 and 3I a2
C
3Ia2 and Ia2
D
3Ia2 and 4Ia2
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