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
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
$$8\widehat i + 8\widehat j - 6\widehat k$$
3
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
4
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
An iron rod of susceptibility 599 is subjected to a magnetizing field of 1200 A m-1. The permeability of the material of the rod is :
$$\left( {{\mu _0} = 4\pi \times {{10}^{ - 7}}Tm{A^{ - 1}}} \right)$$
A
$$8.0 \times {10^{ - 5}}Tm{A^{ - 1}}$$
B
$$2.4\pi \times {10^{ - 5}}Tm{A^{ - 1}}$$
C
$$2.4\pi \times {10^{ - 7}}Tm{A^{ - 1}}$$
D
$$2.4\pi \times {10^{ - 4}}Tm{A^{ - 1}}$$
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