CBSE
Multiple Choice QuestionsA metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at I = 0 and completely emerges out at t = T sec. The current in the ring varies as
An electric dipole placed in a non-uniform electric field experiences
both a torque and a net force
only a force but no torque
only a torque but no net force
no torque and no net force
The magnetic moment of a current (I) carrying circular coil of radius (r) and number of turns (n) varies as
r
r2
The cyclotron frequency of an electron gyrating in a magnetic field of 1 T approximately
28 MHz
280 MHz
2.8 GHz
28 GHz
A conducting ring of radius 1 meter is placed in a uniform magnetic field B of 0.01 tesla oscillating with frequency 100 Hz with its plane at right angle to B. What will be the induced electric field?
volts/m
2 volts/m
10 volts/m
62 volts/m
The magnetic field due to straight conductor of uniform cross-section of radius ' a ' and carrying a steady current is represented by
A proton and an -particle, moving with the same velocity, enter into a uniform magnetic field, acting normal to the plane of their motion. The ratio of the radii of the circular paths described by the proton -particle is
1 : 2
1 : 4
1 : 16
4 : 1
The electric field due to a uniformly charged sphere of radius R as a function of the distance from its centre is represented graphically by
A circular coil of radius is R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as
Circular loop of a wire and a long straight wire carry currents Ic and Ie respectively as shown in figure. Assuming that these are places in the same plane, the magnetic field will be zero at the centre of the loop when separation H is
