NEET Physics PYQ – Moving Charges and Magnetism Practice Set

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Topic Question Set

Q 1 :
A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is [2022]

$6.28 \times 10^{- 2}$ T
$12.56 \times 10^{- 2}$ T
$12.56 \times 10^{- 4}$ T
$6.28 \times 10^{- 4}$ T

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3

4

(2)

Here, number of turns in the solenoid,

$n = 100/1$ $mm = 100 \times 10^{3} / m$

Current in the solenoid, $I = 1$ $A$

Magnetic field strength at the centre of the solenoid, $B = μ_{0} n I$

$= 4 π \times 10^{- 7} \times 10^{5} \times 1 = 12.56 \times 10^{- 2}$ $T$

Q 2 :
A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is $(μ_{0} = 4 π \times 10^{- 7} T$ $m$ $A^{- 1})$ [2020]

$6.28 \times 10^{- 4}$ T
$3.14 \times 10^{- 4}$ T
$6.28 \times 10^{- 5}$ T
$3.14 \times 10^{- 5}$ T

1

2

3

4

(1)

Here, $l = 50 cm, N = 100, i = 2.5 A$

Magnetic field inside the solenoid, $B = μ_{0} n i = \frac{μ_{0} N I}{l}$

$B = \frac{4 π \times 10^{- 7} \times 100 \times 2.5}{0.5} = 6.28 \times 10^{- 4}$ T

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