1
TS EAMCET 2023 (Online) 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
A long straight wire carries a current of 18 A . The magnitude of the magnetic field at a point 12 cm from it is
A
$1.5 \times 10^{-5} \mathrm{~T}$
B
$2 \times 10^{-5} \mathrm{~T}$
C
$3 \times 10^{-5} \mathrm{~T}$
D
$1.8 \times 10^{-5} \mathrm{~T}$
2
TS EAMCET 2023 (Online) 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
A bar magnet has coercivity $4 \times 10^3 \mathrm{Am}^{-1}$. It is placed inside a solenoid of 12 cm length and 60 turns. The current that should be passed through the solenoid to demagnetise, the bar magnet is
A
2 A
B
4 A
C
6 A
D
8 A
3
TS EAMCET 2023 (Online) 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
When a current $i$ through a solenoid is increasing at a constant rate, then the induced current is
A
constant and it will be in the direction of $i$
B
constant and it will be in a direction opposite to the $i$
C
increased with time and it will be in the direction of $i$
D
increased with time and opposite to the direction of $i$
4
TS EAMCET 2023 (Online) 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
In a pair of adjacent coils, if the current in one coil changes from 10 A to 2 A in a time 0.2 s , an emf of 120 V is induced in another coil. The mutual inductance of the pair of the coils is
A
2 H
B
3 H
C
6 H
D
9 H
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