1
TG EAPCET 2025 (Online) 4th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a potentiometer experiment for the determination of the internal resistance of a cell, when an external resistance of $R$ is connected parallel to the cell, the balancing length decreases by $10 \%$. The internal resistance of the cell is

A

$\frac{R}{9}$

B

$\frac{R}{7}$

C

$\frac{R}{5}$

D

$\frac{R}{11}$

2
TG EAPCET 2025 (Online) 4th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The number of turns of two circular coils $A$ and $B$ are 300 and 200 respectively. The magnetic moments of the two coils $A$ and $B$ are in the ratio $1: 2$. If the two coils carry equal currents, then the ratio of radii of coils $A$ and $B$ is

A

$2: \sqrt{3}$

B

$2: 3$

C

$1: 2$

D

$1: \sqrt{3}$

3
TG EAPCET 2025 (Online) 4th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two long straight parallel wires carry currents of 8 A and 10 A in opposite directions. If the distance of separation between the wires is 9 cm , then the net magnetic field at a point between the two wires, which is at a perpendicular distance of 4 cm from the wire carrying 8 A current is

A

zero

B

$4 \times 10^{-5} \mathrm{~T}$

C

$8 \times 10^{-5} \mathrm{~T}$

D

$12 \times 10^{-5} \mathrm{~T}$

4
TG EAPCET 2025 (Online) 4th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A short bar magnet of magnetic moment $2.5 \mathrm{Am}^2$ is kept in a uniform magnetic field of $4 \times 10^{-5} \mathrm{~T}$. The work done in moving the magnet from its most stable position to most unstable position is

A

$40 \times 10^{-5} \mathrm{~J}$

B

$25 \times 10^{-5} \mathrm{~J}$

C

$10 \times 10^{-5} \mathrm{~J}$

D

$20 \times 10^{-5} \mathrm{~J}$

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