Electric Charges and Fields — Physics STD 12 Science — Question

A current carrying long solenoid is placed on the ground with its axis vertical. A proton is falling along the axis of the solenoid with a velocity v. When the proton enters into the solenoid, it will(a) Be deflected from its path(b) Be accelerated along the same path(c) Be decelerated along the same path(d) Move along the same path with no change in velocity

Current I is flowing in a coil of area A and number of turns is N, then magnetic moment of the coil in M equal to

Two ions having masses in the ratio 1 : 1 and charges 1 : 2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2 : 3. The ratio of the radii of circular paths along which the two particles move is(a) 4 : 3(b) 2 : 3(c) 3 : 1(d) 1 : 4

The amount of force exerted on a unit positive charge in an electric field is known as _____?

The natural frequency of an LC - circuit is 1,25,000 cycles per second. Then the capacitor C is replaced by another capacitor with a dielectric medium of dielectric constant k. In this case, the frequency decreases by 25kHz. The value of k is:

In an A.C. circuit the voltage is V, and current is I, then power loss will be :

An electric bulb is made to work at 12 V dc. When this bulb is joined with an ac source, it gives normal brightness. Peak voltage of ac source is:

A power transformer is used to step up an alternating e.m.f. of 220 V to 11 kV to transmit 4.4 kW of power. If the primary coil has 1000 turns, what is the current rating of the secondary ? Assume 100% efficiency for the transformer(a) 4 A(b) 0.4 A(c) 0.04 A (d) 0.2 A