Current Electricity

JEE Main 2024 (Online) 27th January Morning ShiftMCQEasy📈 Topic in 40% papers+4−1

Ques. 1JEE Main 2024, 27 January (Morning Shift)

A wire of resistance R and length L is cut into 5 equal parts. If these parts are joined parallely, then resultant resistance will be :

125R
15R
25 R
5 R

Answer

(1) 125R

Solution

Each part: length L5 resistance r= R5 ( R )

5 equal resistors in parallel: Req = r5 = R25

Answer: (1)

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Ques. 2JEE Main 2024, 27 January (Evening Shift)

Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across A and B, their readings are V1, V2 and V3. Choose the correct option. [figure]

V1=V2
V1 V3-V2
V1+V2=V3
V1+V2>V3

Ques. 3JEE Main 2024, 27 January (Evening Shift)

Wheatstone bridge principle is used to measure the specific resistance (S1) of given wire, having length L, radius r. If X is the resistance of wire, then specific resistance is ; S1=X ( r2L ). If the length of the wire gets doubled then the value of specific resistance will be :

S14
2 S1
S12
S1

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