Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 39

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Magnetic field due to a ring having $n$ turns at a distance $x$ on its axis is proportional to (if $r =$ radius of ring)

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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 40

A circular arc of wire subtends an angle

\frac{π}{2}

at the centre. If it carries a current

I

and its radius of curvature is

R,

then the magnetic field at the centre of the arc is

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 41

The magnetic field of a given length of wire carrying a current for a single turn circular coil at centre is

B,

then its value for two turns for the same wire when same current passing through it is

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 42

If in a circular coil

A

of radius

R

, current

I

is flowing and in another coil

B

of radius

2 R

, a current

2 I

is flowing; then the ratio of the magnetic fields

B_{A}

and

B_{B}

produced by them will be

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 43

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is

B

. It is then bent into a circular loop of

n

turns. The magnetic field at the centre of the coil will be

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 44

The magnetic field due to a current carrying circular loop of radius

3 cm

at a point on the axis at a distance of

4 cm

from the centre is

54 μT

. What will be its value at the centre of the loop

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 45

A long solenoid has

200

turns per

cm

and carries a current

i

. The magnetic field at its centre is

6.28 \times 10^{- 2} Weber / m^{2}

. Another long solenoid has

100

turns per cm and it carries a current

i / 3

. The value of the magnetic field at its centre is

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 46

The magnetic induction at centre $O$ due to the arrangement shown in figure.

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Alpha Question Bank for Medical: Physics>Chapter 25 - Magnetic Effect of Current>Exercise-1>Q 47

A current of $30 amp$ is flowing in a conductor as shown in the figure. The magnetic induction at point $O$ will be

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