Concepts Of Physics MCQ Edition [Volume 2]PhysicsMagnetic Field
In the circuit depicted in the figure, a current of 5.0 A is present. The wire PQ measures 50 cm in length and is immersed in a magnetic field with a magnitude of 0.20 T . Determine the magnetic force exerted on the wire PQ .
Options
- A50 N towards the inside of the circuit
- B0.50 N towards the outside of the circuit
- C50 N towards the outside of the circuit
- D0.50 N towards the inside of the circuit
Correct answer
D. 0.50 N towards the inside of the circuit
Step-by-step solution
Given: Current, I = 5.0 A Length of wire PQ, L = 50 cm = 0.5 m Magnetic field, B = 0.20 T The magnitude of the magnetic force on the current-carrying wire is given by: F = ILB Since the magnetic field is perpendicular to the plane of the circuit, = 90^ . F = 5.0 0.5 0.20 = 0.50 N In the given circuit diagram, the longer line of the battery symbol represents the positive terminal, so the current flows in a clockwise direction. Therefore, the current in wire PQ flows from P to Q (towards the right). The magnetic fiel