Magnetic Effects of Current and Magnetism Practice Questions
NEET · Physics · 1552 free MCQs with instant results and detailed explanations.
1552
Total
367
Easy
686
Medium
499
Hard
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Topics in Magnetic Effects of Current and Magnetism
Earth's Magnetism
288
Bar Magnet
262
Galvanometer
258
Magnetic Force on Conductor
234
Ampere's Law
246
Biot-Savart Law
264
Sample Questions from Magnetic Effects of Current and Magnetism
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What does the Biot-Savart Law describe?
A.
The force between two parallel currents
B.
The magnetic field generated by a current-carrying conductor
C.
The energy stored in a magnetic field
D.
The motion of charged particles in a magnetic field
Show Answer & Explanation
Correct Answer: B
The Biot-Savart Law describes how a current-carrying conductor generates a magnetic field around it, providing a method to calculate that magnetic field.
Q2
Easy
According to the Biot-Savart Law, what is the relationship between the magnetic field (dB) and the current (I)?
A.
dB โ I
B.
dB โ Iยฒ
C.
dB โ 1/I
D.
dB โ 1/Iยฒ
Show Answer & Explanation
Correct Answer: A
The Biot-Savart Law states that the magnetic field created at a point is directly proportional to the current flowing through the conductor.
Q3
Easy
If the current in a long straight wire is doubled, how does the magnetic field at a point 10 cm away from the wire change?
A.
It doubles
B.
It becomes four times
C.
It remains the same
D.
It halves
Show Answer & Explanation
Correct Answer: A
According to the Biot-Savart Law, the magnetic field is directly proportional to the current; hence, doubling the current doubles the magnetic field.
Q4
Medium
What does the Biot-Savart law state regarding the magnetic field due to a current-carrying conductor?
A.
The magnetic field is inversely proportional to the square of the distance.
B.
The magnetic field is directly proportional to the current and length of the conductor.
C.
The magnetic field is proportional to the angle between the current and the observation point.
D.
The magnetic field is independent of the medium surrounding the conductor.
Show Answer & Explanation
Correct Answer: B
The Biot-Savart law states that the magnetic field produced is directly proportional to the current and the length of the conductor segment.
Q5
Medium
A straight conductor carrying a current of 5 A is placed at a distance of 0.1 m from a point. What is the magnetic field at that point?
A.
0.1 T
B.
0.25 T
C.
0.05 T
D.
0.01 T
Show Answer & Explanation
Correct Answer: C
Using the Biot-Savart law, the magnetic field B = (ฮผโ/4ฯ) * (I * d sinฮธ) / rยฒ at a perpendicular distance gives B = (4ฯ x 10^-7 Tm/A) * (5 A) / (0.1 m)ยฒ = 0.05 T.
Q6
Medium
When the angle between the current and the radial line to the point of observation is 90 degrees, what can be concluded about the magnetic field?
A.
It is maximum.
B.
It is zero.
C.
It is minimum.
D.
It is proportional to the current.
Show Answer & Explanation
Correct Answer: B
When the angle is 90 degrees, sin(90) = 1, but since the radial line is perpendicular, the magnetic field contribution becomes zero.
Q7
Medium
If a circular loop of radius r carries current I, what is the expression for the magnetic field at the center of the loop?
A.
(ฮผโI)/(2r)
B.
(ฮผโI)/(4ฯr)
C.
(ฮผโI)/(2rยฒ)
D.
(ฮผโI)/(4r)
Show Answer & Explanation
Correct Answer: A
The magnetic field at the center of a circular loop is given by B = (ฮผโI)/(2r).
Q8
Hard
A circular loop of radius 0.1 m carries a current of 5 A. Calculate the magnetic field at the center of the loop using the Biot-Savart law. (Use ฮผโ = 4ฯ x 10โปโท Tm/A)
A.
1.57 x 10โปโต T
B.
3.14 x 10โปโต T
C.
2.51 x 10โปโต T
D.
6.28 x 10โปโต T
Show Answer & Explanation
Correct Answer: A
The magnetic field B at the center of the loop is given by B = (ฮผโ * I) / (2 * r) = (4ฯ ร 10โปโท Tm/A * 5 A) / (2 * 0.1 m) = 1.57 x 10โปโต T.
Q9
Hard
Using the Biot-Savart law, how does the magnetic field vary with distance (r) from an infinitely long straight conductor carrying current I?
A.
B โ r
B.
B โ 1/r
C.
B โ rยฒ
D.
B โ rโปยฒ
Show Answer & Explanation
Correct Answer: B
According to Biot-Savart law, B decreases inversely with distance from a long straight current-carrying wire; thus, B โ 1/r.
Q10
Hard
Two infinitely long parallel wires carry currents of 10 A and 15 A in opposite directions. What is the force per unit length between these wires?
A.
7.5 ร 10โปโถ N/m
B.
1.5 ร 10โปโถ N/m
C.
2.0 ร 10โปโถ N/m
D.
3.0 ร 10โปโถ N/m
Show Answer & Explanation
Correct Answer: A
The force per unit length F between two parallel wires is given by F = (ฮผโ/2ฯ) * (Iโ * Iโ) / d. Assuming d = 1 m, F = (4ฯ ร 10โปโท) * (10 * 15) / (2ฯ) = 7.5 ร 10โปโถ N/m.
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Magnetic Effects of Current and Magnetism โ NEET Physics Practice Questions Online
This page contains 1552 practice MCQs for the chapter Magnetic Effects of Current and Magnetism in NEET Physics. The questions are organized by difficulty โ 367 easy, 686 medium, 499 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 6 topics, giving you comprehensive coverage of the entire chapter.