1 of 20 What is the direction of the magnetic field at the position marked by th

Question

1 of 20 What is the direction of the magnetic field at the position marked by the X? NI X Left O Right Into the screen Out of the screen 2 of 20 A light bulb connects to a battery. A second, identical light bulb connects in parallel to the first light bulb (see below). The connecting wires have negligible resistance. When the switch is closed, the original light bulb will O no longer light. become brighter become dimmer experience no change in brightness 3 of 20 What is the magnitude of the force on a +3 mC charge moving at a speed of 1000 m/s through a 1.25 T magnetic field? 0.42 N 3.75 N 2.4 N 0.0013 N

Explanation / Answer

1. to right, the direction of magnetic field is away from the north poles like electric field from a +ve charge.

2. the bulb become dimmer as the current through it reduces.

3. Magnetic force Fm = Bvq = 1.25*1000*3e-3 = 3.75 N

4. Up

5. Magnetic force on a current carring conductor

     F = B x I = BI = 2.0*4 = 8 N

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