1
JEE Main 2023 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1

The charge flowing in a conductor changes with time as $$\mathrm{Q}(\mathrm{t})=\alpha \mathrm{t}-\beta \mathrm{t}^{2}+\gamma \mathrm{t}^{3}$$. Where $$\alpha, \beta$$ and $$\gamma$$ are constants. Minimum value of current is :

A
$$\beta-\frac{\alpha^{2}}{3 \gamma}$$
B
$$\alpha-\frac{3 \beta^{2}}{\gamma}$$
C
$$\alpha-\frac{\beta^{2}}{3 \gamma}$$
D
$$\alpha-\frac{\gamma^{2}}{3 \beta}$$
2
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus

With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is

(A) directly proportional to the length of the potentiometer wire

(B) directly proportional to the potential gradient of the wire

(C) inversely proportional to the potential gradient of the wire

(D) inversely proportional to the length of the potentiometer wire

Choose the correct option for the above statements :

A
A only
B
B and D only
C
A and C only
D
inversely C only
3
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1

Ratio of thermal energy released in two resistors R and 3R connected in parallel in an electric circuit is :

A
1 : 1
B
1 : 27
C
1 : 3
D
3 : 1
4
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1

The resistance of a wire is 5 $$\Omega$$. It's new resistance in ohm if stretched to 5 times of it's original length will be :

A
25
B
625
C
5
D
125
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