Q. What happens to the magnetic field inside a long solenoid when the current through it is increased?
A.Magnetic field decreases
B.Magnetic field remains constant
C.Magnetic field increases
D.Magnetic field becomes zero
Solution
The magnetic field inside a long solenoid is directly proportional to the current flowing through it. Increasing the current increases the magnetic field strength.
Q. What happens to the magnetic field strength if the distance from a long straight conductor is doubled?
A.It doubles
B.It halves
C.It quadruples
D.It becomes zero
Solution
The magnetic field strength around a long straight conductor is inversely proportional to the distance from the conductor. Therefore, if the distance is doubled, the magnetic field strength halves.
Q. What happens to the magnetic field strength inside a long solenoid when the current through it is increased?
A.It decreases
B.It remains constant
C.It increases
D.It becomes zero
Solution
The magnetic field strength inside a long solenoid is directly proportional to the current flowing through it; thus, it increases with an increase in current.
Q. What is the direction of the magnetic field around a straight current-carrying conductor?
A.From north to south
B.From south to north
C.Clockwise
D.Counterclockwise
Solution
The direction of the magnetic field around a straight current-carrying conductor can be determined using the right-hand rule, which indicates that the field lines form concentric circles around the conductor in a counterclockwise direction when viewed from the positive end.
Q. What is the effect of increasing the current in a solenoid on the magnetic field inside it?
A.Increases
B.Decreases
C.Remains the same
D.Becomes zero
Solution
The magnetic field inside a solenoid is directly proportional to the current flowing through it. Therefore, increasing the current increases the magnetic field strength.
Q. What is the effect of increasing the number of turns in a solenoid on the magnetic field inside it?
A.Magnetic field decreases
B.Magnetic field remains constant
C.Magnetic field increases
D.Magnetic field becomes zero
Solution
The magnetic field inside a solenoid is directly proportional to the number of turns per unit length. Increasing the number of turns increases the magnetic field strength.
Q. What is the force experienced by a charge q moving with velocity v in a magnetic field B?
A.qvB
B.qvB sin(θ)
C.qvB cos(θ)
D.qvB tan(θ)
Solution
The force experienced by a charge q moving with velocity v in a magnetic field B is given by the Lorentz force law: F = q(v × B), which can be expressed as F = qvB sin(θ), where θ is the angle between the velocity and the magnetic field.
Q. What is the force experienced by a charge q moving with velocity v in a magnetic field B at an angle θ?
A.qvB
B.qvB sin(θ)
C.qvB cos(θ)
D.qvB tan(θ)
Solution
The magnetic force on a charge moving in a magnetic field is given by F = qvB sin(θ), where θ is the angle between the velocity and the magnetic field.
Q. What is the formula for the magnetic force experienced by a charged particle moving in a magnetic field?
A.F = qE
B.F = qvBsin(θ)
C.F = mv^2/r
D.F = BIL
Solution
The magnetic force on a charged particle is given by F = qvBsin(θ), where q is the charge, v is the velocity, B is the magnetic field strength, and θ is the angle between the velocity and the magnetic field.