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NEET UG PHYSICS Multiple Choice Questions (MCQs)

MCQs - Magnetic Effects of Current and Magnetism

MCQs - Magnetic Effects of Current and Magnetism (Serial 181 to 195)

181. What does Biot-Savart law help determine?

a) The magnetic field at a point due to a moving charge

b) The electric field at a point due to a moving charge

c) The electric potential at a point

d) The magnetic force on a moving charge

Answer: a) The magnetic field at a point due to a moving charge

182. What is the magnetic field at the center of a current-carrying circular loop given the current is I and the radius is R?

a) \( \frac{{\mu_0 I}}{{2R}} \)

b) \( \frac{{\mu_0 I}}{{4R}} \)

c) \( \frac{{\mu_0 I}}{{R}} \)

d) \( \frac{{2 \mu_0 I}}{{R}} \)

Answer: a) \( \frac{{\mu_0 I}}{{2R}} \)

183. According to Ampere’s law, what is the magnetic field at a point due to an infinitely long current-carrying straight wire?

a) \( \frac{{\mu_0 I}}{{2 \pi r}} \)

b) \( \frac{{\mu_0 I}}{{r}} \)

c) \( \frac{{\mu_0 I}}{{4 \pi r}} \)

d) \( \frac{{I}}{{2 \pi r}} \)

Answer: a) \( \frac{{\mu_0 I}}{{2 \pi r}} \)

184. What is the force on a moving charge in a magnetic field?

a) \( F = qvB \)

b) \( F = qvB \sin \theta \)

c) \( F = qvB \cos \theta \)

d) \( F = qvB \)

Answer: b) \( F = qvB \sin \theta \)

185. The force on a current-carrying conductor in a uniform magnetic field depends on all of the following except:

a) Length of the conductor

b) Magnetic field strength

c) Current in the conductor

d) Resistance of the conductor

Answer: d) Resistance of the conductor

186. What is the force between two parallel current-carrying conductors placed at a distance d apart?

a) \( F = \frac{{\mu_0 I_1 I_2}}{{2 \pi d}} \)

b) \( F = \frac{{\mu_0 I_1 I_2}}{{d}} \)

c) \( F = \frac{{I_1 I_2}}{{2 \pi d}} \)

d) \( F = \frac{{I_1 I_2}}{{d}} \)

Answer: a) \( F = \frac{{\mu_0 I_1 I_2}}{{2 \pi d}} \)

187. What does the torque experienced by a current loop in a uniform magnetic field depend on?

a) Magnetic moment of the loop and the magnetic field strength

b) Current in the loop and the area of the loop

c) Magnetic field strength and the number of turns of the loop

d) The charge on the conductor and the field strength

Answer: a) Magnetic moment of the loop and the magnetic field strength

188. What is the primary use of a moving coil galvanometer?

a) To measure the magnetic field

b) To measure very small currents

c) To measure voltage across a component

d) To measure resistance of a component

Answer: b) To measure very small currents

189. How can a moving coil galvanometer be converted into an ammeter?

a) By inserting a low resistance in parallel with it

b) By inserting a high resistance in series with it

c) By increasing the number of turns in the coil

d) By changing the galvanometer's scale

Answer: a) By inserting a low resistance in parallel with it

190. What is the magnetic dipole moment of a current loop?

a) Current times the area of the loop

b) Area times the number of turns in the loop

c) Current times the radius of the loop

d) Current times the volume of the loop

Answer: a) Current times the area of the loop

191. What is the magnetic field due to a magnetic dipole along its axis?

a) \( B = \frac{{\mu_0 m}}{{2 \pi r^3}} \)

b) \( B = \frac{{\mu_0 m}}{{4 \pi r^3}} \)

c) \( B = \frac{{\mu_0 m}}{{r^3}} \)

d) \( B = \frac{{\mu_0 m}}{{2 r^3}} \)

Answer: d) \( B = \frac{{\mu_0 m}}{{2 r^3}} \)

192. The torque on a magnetic dipole in a uniform magnetic field is maximum when:

a) The angle between the dipole moment and magnetic field is 90°

b) The angle between the dipole moment and magnetic field is 0°

c) The dipole moment is perpendicular to the magnetic field

d) The angle is 45°

Answer: a) The angle between the dipole moment and magnetic field is 90°

193. Which of the following substances is an example of a ferromagnetic material?

a) Copper

b) Iron

c) Glass

d) Wood

Answer: b) Iron

194. What is the effect of increasing temperature on the magnetic properties of a ferromagnetic substance?

a) It enhances its magnetic properties

b) It reduces its magnetic properties

c) It makes it non-magnetic

d) No change in its properties

Answer: b) It reduces its magnetic properties

195. What is the property of materials with a high magnetic permeability?

a) They are easily magnetized

b) They have weak magnetic properties

c) They are non-magnetic

d) They repel magnetic fields

Answer: a) They are easily magnetized

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