1
JEE Main 2023 (Online) 12th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A wire of resistance $$160 ~\Omega$$ is melted and drawn in a wire of one-fourth of its length. The new resistance of the wire will be

A
$$640 ~\Omega$$
B
$$40 ~\Omega$$
C
$$16 ~\Omega$$
D
$$10 ~\Omega$$
2
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

JEE Main 2023 (Online) 11th April Evening Shift Physics - Current Electricity Question 40 English

The current flowing through R$$_2$$ is :

A
$$\frac{1}{2} \mathrm{~A}$$
B
$$\frac{1}{3} \mathrm{~A}$$
C
$$\frac{1}{4} \mathrm{~A}$$
D
$$\frac{2}{3} \mathrm{~A}$$
3
JEE Main 2023 (Online) 11th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced in same time for parallel to series will be:

A
4 : 1
B
1 : 4
C
2 : 1
D
1 : 2
4
JEE Main 2023 (Online) 11th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The current sensitivity of moving coil galvanometer is increased by $$25 \%$$. This increase is achieved only by changing in the number of turns of coils and area of cross section of the wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be:

A
+25%
B
$$-$$50%
C
$$-$$25%
D
Zero
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