Electromagnetism
Current Electricity
MCQ (Single Correct Answer)
Moving Charges and Magnetism
MCQ (Single Correct Answer)
Magnetism and Matter
MCQ (Single Correct Answer)
Electromagnetic Induction
MCQ (Single Correct Answer)
Alternating Current
MCQ (Single Correct Answer)
Electromagnetic Waves
MCQ (Single Correct Answer)
Modern Physics
Dual Nature of Radiation
MCQ (Single Correct Answer)
Semiconductor Devices and Logic Gates
MCQ (Single Correct Answer)
Communication Systems
MCQ (Single Correct Answer)
1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

The resistance of a wire is R ohm. If it is melted and stretched to n times its original length, its new resistance will be

A
$$nR$$
B
$${R \over n}$$
C
$${n^2}R$$
D
$${R \over {{n^2}}}$$
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

For the given electrical arrangement, what is the value of current I?

COMEDK 2021 Physics - Current Electricity Question 32 English

A
6A
B
5A
C
7A
D
8A
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

If voltage $$V=(200\pm 8)V$$ and current $$I=(20\pm0.5)A$$, then the percentage error in resistance R is

A
5.2%
B
25%
C
3%
D
6.5%
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

Point out the right statements about the validity of Kirchhoff’s junction rule,

A
it is based on conservation of charge.
B
outgoing currents add up and are equal to incoming currents at a junction.
C
bending or reorienting the wire does not change the validity of Kirchhoff's junction rule.
D
All of the above.
COMEDK Subjects