1.
Fleming's right hand rule gives
3.
The force of repulsion between two parallel wires is f when each one of them carries a certain current /. If the current in each is doubled, the force between them would be
4.
The unit of induced emf is
5.
Choose the correct statement:
6.
The force between two parallel wires carrying currents has been used to define
7.
By increasing the number of turns in the coil, the strength of the magnetic field
8.
Ampere rule is used to find the
9.
It is a common notion that the earth's magnetism is due to the
10.
If current in the core decreases, the strength of the magnetic field
11.
The coil of a heater is cut into two equal halves and only one of them is used in the beater. The ratio of the heat produced by this half of the col to that produced by the original coil is
12.
An electric iron draws a current of 4 A when connected to a 220 V mains. Its resistance must be
13.
The fact that current is associated with a magnetic field was discovered by
14.
The unit of magnetic flux is
15.
The resistance of a conductor is reduced to half its initial value. In doing so the heating effects in the conductor will become
17.
A magnetic field cannot exert any force on a
18.
A compass needle just above a wire in which electrons are moving towards east, will point
19.
A magnetic field can exert force on a
20.
By inserting a soft iron piece into a solenoid, the strength of the magnetic field
