Last Faraday Night. A galvanometer is connected across a solenoid, which is in a uniform external magnetic field. Which of the following cases will cause a deflection in the galvanometer needle?

I. Gradually decreasing the magnetic field strength to zero.

II. Tilting 60° from horizontal

III. Squeezing the solenoid's cross-sectional area

Move it. Consider a conducting bar with length 1.0 [m], moving at a speed of 0.25 [m/s] to the right, connected to a 100. [Ω] resistor as shown. The circuit is immersed in a uniform magnetic field with strength 4.0 [T] directed into the page. The bar and connecting wires have negligible resistance. What is the magnitude of the induced current through the resistor?

May butas. A conducting tube with inner radius and outer radius is carrying a current of out of the page that is uniformly distributed along its cross-sectional area. What is the magnetic field at region ? Use a clockwise Amperean loop.

BDL. Shown are 3 integration paths shaped like letters B, D, and L with enclosed identical currents with directions shown. What is the correct order of their line integral ?

Concentrix. Consider two concentric circular loops of radius and , respectively, lying in the -plane. Each loop carries a current moving in the directions shown. What is the magnitude of the net magnetic field at point at distance from the center of the loops?

Singkil. Consider four long, straight, parallel wires arranged in the corners of a 20.0 [cm] square and are carrying currents directed as shown in the figure. The into the page currents are 5.0 [A], while the out of the page currents are 2.5 [A]. What is the magnitude and direction of at point , the center of the square?

Stability Check. Consider a circular loop shown which carry current in the direction indicated. If the loop is in a uniform magnetic field in the -direction, which of the following statements is/are TRUE about the loop?

I. The loop is in stable equilibrium.

II. The loop is in unstable equilibrium.

III. The loop experiences no torque.

Scattering charges. The figure shows a system of three electrons moving at velocities and a proton moving at velocity as shown. All charges are in the plane of the page (xy-plane). What is the magnitude and direction of the net magnetic field at point ?

Two lanes. Consider two current-carrying wires shown in the figure. The top wire at is carrying a current to the right and contains a charge element of width at . The bottom wire at is carrying a current to the left and contains a charge element of width at . What is the net magnetic field at due to these charge elements?

B-I-N-I-verse. A wire, bent as shown, is immersed in a uniform magnetic field 2.50 [T] directed to the right. The vertical segments are 1 [m] long while the diagonal segment is [m]. Current 4.00 [A] flows in the direction shown. What is the net force on the wire?