Two coaxial solenoids of different radii carry current I in the same direction. Let F 1 → be the magnetic force on the inner solenoid due to the outer one and F 2 → be the magnetic force on the outer solenoid due to the inner one. Then:

F 1 → is radially outwards and F 2 → = 0

F 1 → is radially inwards and F 2 → is radially outwards

F 1 → is radially inwards and F 2 → = 0

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The strength of the magnetic field at a distance $r$ near a long straight current-carrying wire is $B$ . The field at a distance $\frac{r}{2}$ will be

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Important Questions on Magnetic Effect of Current

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 19

A wire in the form of a square of side

' a'

carries a current

i .

Then the magnetic induction at the centre of the square wire is (Magnetic permeability of free space

= μ_{0}

)

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 20

The vector form of Biot-Savart's law for a current carrying element is

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 21

Two long straight wires are kept parallel. A current of $1 ampere$ is flowing in each wire in same direction. Distance between them is $2 r$ . The intensity of magnetic field at the midpoint between them

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 22

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

x - y

plane along the

x

and

y -

axis 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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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 23

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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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 24

Two long parallel wires are at a distance

2 d

apart. They carry steady equal currents flowing out of the plane of the paper, as shown. The variation of the magnetic field

B

along the

X X'

is given by

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 26

A current

i Ampere

flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is :

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 27

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

\frac{a}{2}

and

2 a

The strength of the magnetic field at a distance r near a long straight current-carrying wire is B. The field at a distance r2 will be

Important Questions on Magnetic Effect of Current

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The strength of the magnetic field at a distance $r$ near a long straight current-carrying wire is $B$ . The field at a distance $\frac{r}{2}$ will be