True or False? (5 pt each) Place your answer T or F to the immediate left of the

Question

True or False? (5 pt each) Place your answer T or F to the immediate left of the question
number and explain your answer in the space provided.

1. The magnetic field due to a straight line of current is always perpendicular to the current.

2. A magnetic field cannot exert a force on a neutral current carrying wire.

3. A single diverging lens can never create a real image.

4. The net magnetic force on a current loop in a magnetic field can be zero even if the net magnetic
torque on the current loop is not zero.

5. The ray approximation is valid for human sight. (Visible light has a wavelength of 400-800 nm
(nano = 10-9) and the diameter of the pupil of the human eye is about 5mm).

Explanation / Answer

1. The magnetic field due to a straight line of current is always perpendicular to the current.

TRUE , as the magnetic field is given by Biot savart's law

2. A magnetic field cannot exert a force on a neutral current carrying wire.

False , force is given as F = iL X B

3. A single diverging lens can never create a real image.

TRUE , as the diverging lens always produce a virtual image.

4. The net magnetic force on a current loop in a magnetic field can be zero even if the net magnetic
torque on the current loop is not zero.

TRUE , as the torque is given as T = iA X B

5. The ray approximation is valid for human sight. (Visible light has a wavelength of 400-800 nm
(nano = 10-9) and the diameter of the pupil of the human eye is about 5mm).

TRUE , as the wavelength is very small than the pupil of eye

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