NEET Questions - Physics - Magnetic Effects of Current and Magnetism

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An element $ \vec dl = dx \uparrow $ (where dx = 1 cm) is placed at the origin and carries a large current I = 10 Amp. What is the mag. field on the Y-axis at a distance of 0.5 meter ?

$ 2 \times 10^{-8} \hat k T $
$ 4 \times 10^{-8} \hat k T $
$ -2 \times 10^{-8} \hat k T $
$ -4 \times 10^{-8} \hat k T $

Two straight long conductors AOB and COD are perpendicular to each other and carry currents $I_1$ and $I_2$. The magnitude of the mag. field at a point "P" at a distance "a" from the point "O" in a direction perpendicular to the plane ABCD is

$ { \mu_0 \over 2 \pi a } ( I_1 +I_2 ) $
$ { \mu_0 \over 2 \pi a } ( I_1 - I_2 ) $
$ { \mu_0 \over 2 \pi a } ( I_1^2 +I_2^2 )^{1/2} $
$ { \mu_0 \over 2 \pi a } ( {I_1 I_2 \over I_1+I_2 } ) $

A length L of wire carries a steady current 1. It is bent first to form a coil of 1 turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is.................

A quater of its first value
Un changed
Four times of its first value
A half of its first value

If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be ................

Only inside the pipe
Only outside the pipe
Neither inside nor outside the pipe
Both inside and outside the pipe

The magnetic induction at a point P which is at a distance 4 cm from a long current carrying wire is $10^{-8} $ tesla. The field of induction at a distance 12 cm from the same current would be ...............tesla.

$ 3.33 \times 10^{-9} $
$ 1.11 \times 10^{-4} $
$ 3 \times 10^{-3} $
$ 9 \times 10^{-2} $

The strength of the magnetic field at a point y near a long straight current carrying wire is B. The field at a distance y/2 will be

B/2
B/4
2B
4B

The mag. field (B) at the centre of a circular coil of radius "a", through which a current I flows is.............

$ B \alpha a $
$ B \alpha { 1 \over I }$
$ B \alpha I $
$ B \alpha I^2 $

A current of a 1 Amp is passed through a straight wire of length 2 meter. The magnetic field at a point in air at a distance of 3 meters from either end of wire and lying on the axis of wire will be............

$ { \mu_o \over 2\pi } $
$ { \mu_o \over 4 \pi } $
$ { \mu_o \over 8 \pi } $
Zero

If the strength of the magnetic field produced at 10 cm away from a infinitely long straight conductor is $10^{-5} $ tesla. The value of the current flowing in the conductor will be............... Ampere.

5
10
500
1000

A long straight wire of radius "a" carries a steady current I the current is uniformly distributed across its cross-section. The ratio of the magnetic field at a/2 and 2a is .................

1/4
4
1
1/2

At a distance of 10 cm from a long straight wire carrying current, the magnetic field is $ 4 \times 10^{-2} $ .At the distance of 40 cm, the magnetic field will be Tesla.

$ 1 \times 10^{-2} $
$ 2 \times 10^{-2} $
$ 8 \times 10^{-2} $
$ 16 \times 10^{-2} $

A He nucleus makes a full rotation in a circle of radius 0.8 meter in 2 sec. The value of the mag. field B at the centre of the circle will be ………...Tesla.

$ { 10^{-19} \over \mu_o}$
$ { 10^{-19} \mu_o}$
$ { 2 \times 10^{-10} \mu_o}$
$ { 2 \times 10^{-10} \over \mu_o}$

The direction of mag. field lines close to a straight conductor carrying current will be ...............

Along the length of the conductor
Radially outward
Circular in a plane perpendicular to the conductor
Helical

Due to 10 Amp of current flowing in a circular coil of 10 cmradius, the mag. field produced at its centre is$ \ pi \times 10^{-3 } $ Tesla. The number of turns in the coil will be

5000
100
50
25

The distance at which the magnetic field on axis as compared to the mag. field at the centre of the coil carrying current I and radius R is 1/8 , would be

R
$ \sqrt 2 R $
2R
$ \sqrt 3 R $

NEET Physics Questions: Magnetic Effects of Current and Magnetism