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The magnetic field $B$ at $O$ due to current carrying loop placed in the $x - y$ plane as shown in the figure is

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Important Questions on Magnetic Effects of Current

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 87

If the current is flowing clockwise in a circular coil, the direction of magnetic lines of force inside the coil is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 88

Two concentric coils of

10

turns each are situated in the same plane. Their radii are

2 cm

and

4 cm

and they carry respectively

0.2

and

0.3 A

current in opposite directions. The magnetic field (in

Wb m^{- 2}

) at the centre is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 89

A given length of a wire carries a steady current. It is bent first to form a circular plane coil of one turn. If a loop of 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

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 90

Two infinitely long, thin, insulated, straight wires lie in the

x - y

plane along the

x

and

y

-axes respectively. Each wire carries a current

i

, respectively in the positive

x

-direction and positive

y

-direction. The magnetic field will be zero at all points on the straight line

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 91

There are two identical concentric coils of suitable radii

X

and

Y

with their planes at right angles to each other. The coil

X

lies in the horizontal plane while coil

Y

lies in the vertical plane. If the coil

X

carries a current of

1 A

then what value of current in coil

Y

be passed, so that the resultant field at the centre of the coils just balances the earth's magnetic field of

10^{- 5} T

inclined at

30 °

with the vertical?

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 92

Two parallel, long wires carry currents

i_{1}

and

i_{2}

with

i_{1} > i_{2}

. When the currents are in the same direction, the magnetic field at a point midway between the wires is

10 μ T

. If the direction of

i_{2}

is reversed, the field becomes

30 μ T

. The ratio

\frac{i_{1}}{i_{2}}

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 93

In a coaxial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>Objective Problems [ Level 1 ]>Q 96

Magnetic effect of current was discovered by

The magnetic field B at O due to current carrying loop placed in the x-y plane as shown in the figure is

Important Questions on Magnetic Effects of Current

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The magnetic field $B$ at $O$ due to current carrying loop placed in the $x - y$ plane as shown in the figure is