The current in a long solenoid of radius 3 cm and 20 turns/cm is varied with time at a rate of 2 A/s. Find the electric field at a distance of 4 cm from the center of the solenoid.

A magnetic field of strength 0.29 T is directed perpendicular to a plane circular loop of wire of radius 29 cm. Find the magnetic flux through the area enclosed by this loop.

(a) A conducting loop in the shape of a square of edge length ℓ = 0.460 m carries a current I = 8.00 A as in the figure above. Calculate the magnitude and direction of the magnetic field at the center of the square. magnitude  µT direction         (b) If this conductor is reshaped to form a circular loop and carries the same current, what is the value of the magnetic field at the center? magnitude  µT direction

A conductor is moving to left direction in a region where uniform magnetic field is directed ino the page. Which point of the conductor (a or b) is at higher potential?

Consider the cylindrical conductor with a hollow center and copper walls of thickness b-a as shown. The radii of the inner and outer walls are a and b respectively. and the current I is uniformly spread over the cross section of the copper (shaded region). What is the magnitude of the magnetic field in units of nT at r- 24.1cm. a=13cm, b=30.5cm, 7- 200mA, Hom4 x 10 Tm/A. Provide your answer with two decimal places. A -- 01 (out of page)

The force on a wire is a maximum of 4.38 N when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is turned on. If the pole faces have a diameter of 12.9 cm, estimate the current in the wire if the field is 0.184 T. If the wire is tipped so that it now makes an angle of 15.1° with the horizontal, what force will it now feel?