26.A long wire carries a current of 20 A along the axis of a solenoid, the field due to the solenoid is 4 mT. The resultant field at a point 3 mm from the solenoid axis is:

27.A conducting loop carrying a current is placed in a non-uniform magnetic field perpendicular to the plane of loop. Then:

28.A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity, then:

29.The direction of magnetic field at a point due to an infinitely long wire carrying current is: